The following is a project settings actions script that I cooked up to handle a more graceful Acrobat check, with user option to install or not install. You will need to have the AcroReader51_ENU_full.exe installer (available from Adobe.com) in order to use this precise script - put that in your Distribution folder for the project. Feel free to modify and share!
The script will check to see if a default PDF viewer is present on the system, and what version that viewer is. If the version pre-dates 5.0.0.0 (of none exists at all), then it will present the option to install the 5.1 version of the software.
<IR_ACTIONS_LIST>
<Action name="Comment">
<Type>202</Type>
<Function>2</Function>
<DTIndentLevel>0</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
<Comment>PDF Checker/Installer Script by Eric Darling v. 5.1</Comment>
</Action>
<Action name="Comment">
<Type>202</Type>
<Function>2</Function>
<DTIndentLevel>0</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
<Comment>Set a default value if nothing returned from PDF viewer search</Comment>
</Action>
<Action name="Set Value">
<Type>6</Type>
<Function>0</Function>
<DTIndentLevel>1</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
<Variable>%pdfviewer%</Variable>
<Value>NOTFOUND</Value>
<Evaluate>0</Evaluate>
</Action>
<Action name="Comment">
<Type>202</Type>
<Function>2</Function>
<DTIndentLevel>0</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
<Comment>Note: On Error user notification set to "none" for the next action</Comment>
</Action>
<Action name="Get Default Viewer">
<Type>13</Type>
<Function>0</Function>
<DTIndentLevel>1</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>0</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel>INSTALL ACROBAT</JumpToLabel>
</ErrorHandling>
<Variable>%pdfviewer%</Variable>
<FileExtension>.PDF</FileExtension>
</Action>
<Action name="IF">
<Type>200</Type>
<Function>1</Function>
<DTIndentLevel>0</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
<Condition>%pdfviewer% = "NOTFOUND"</Condition>
</Action>
<Action name="LABEL">
<Type>208</Type>
<Function>1</Function>
<DTIndentLevel>0</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
<Label>INSTALL QUESTION</Label>
</Action>
<Action name="Comment">
<Type>202</Type>
<Function>2</Function>
<DTIndentLevel>1</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
<Comment>This will bring up a dialog box to ask if user wants to install Acrobat 5.1</Comment>
</Action>
<Action name="Message Box">
<Type>5</Type>
<Function>0</Function>
<DTIndentLevel>2</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
<DialogTitle>Install Acrobat</DialogTitle>
<DialogMessage>Setup detected that this computer has either an outdated version of Adobe Acrobat Reader, or no installation of Acrobat Reader present at all. To install version 5.1 of the Adobe Acrobat Reader software on this computer, please answer OK. To skip this installation, click Cancel (you will not be able to view PDF files on this computer).</DialogMessage>
<Icon>3</Icon>
<Variable>%InstallResult%</Variable>
<DialogType>2</DialogType>
<DefaultButton>0</DefaultButton>
</Action>
<Action name="ELSE">
<Type>206</Type>
<Function>1</Function>
<DTIndentLevel>0</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
</Action>
<Action name="GOTO">
<Type>209</Type>
<Function>1</Function>
<DTIndentLevel>1</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
<Label>VERSION CHECK</Label>
</Action>
<Action name="END IF">
<Type>201</Type>
<Function>1</Function>
<DTIndentLevel>0</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
</Action>
<Action name="IF">
<Type>200</Type>
<Function>1</Function>
<DTIndentLevel>0</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
<Condition>%InstallResult% = OK</Condition>
</Action>
<Action name="GOTO">
<Type>209</Type>
<Function>1</Function>
<DTIndentLevel>1</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
<Label>INSTALL ACROBAT</Label>
</Action>
<Action name="ELSE">
<Type>206</Type>
<Function>1</Function>
<DTIndentLevel>0</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
</Action>
<Action name="Comment">
<Type>202</Type>
<Function>2</Function>
<DTIndentLevel>1</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
<Comment>If user clicks cancel, dump out of install</Comment>
</Action>
<Action name="GOTO">
<Type>209</Type>
<Function>1</Function>
<DTIndentLevel>2</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
<Label>END</Label>
</Action>
<Action name="END IF">
<Type>201</Type>
<Function>1</Function>
<DTIndentLevel>0</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
</Action>
<Action name="LABEL">
<Type>208</Type>
<Function>1</Function>
<DTIndentLevel>0</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
<Label>INSTALL ACROBAT</Label>
</Action>
<Action name="Comment">
<Type>202</Type>
<Function>2</Function>
<DTIndentLevel>1</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
<Comment>This will install Acrobat Reader version 5.1_English</Comment>
</Action>
<Action name="Busy">
<Type>135</Type>
<Function>0</Function>
<DTIndentLevel>2</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
<Display>TRUE</Display>
<Text>Please Wait While Acrobat Reader is Installed...</Text>
</Action>
<Action name="Execute">
<Type>8</Type>
<Function>0</Function>
<DTIndentLevel>2</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
<FileName>%SrcDir%\AcroReader51_ENU_full.exe</FileName>
<CommandLine/>
<WorkingDir/>
<RunMode>0</RunMode>
<WaitForReturn>1</WaitForReturn>
</Action>
<Action name="GOTO">
<Type>209</Type>
<Function>1</Function>
<DTIndentLevel>2</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
<Label>FINISH</Label>
</Action>
<Action name="LABEL">
<Type>208</Type>
<Function>1</Function>
<DTIndentLevel>0</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
<Label>VERSION CHECK</Label>
</Action>
<Action name="Comment">
<Type>202</Type>
<Function>2</Function>
<DTIndentLevel>1</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
<Comment>Check for the version of Acrobat Reader</Comment>
</Action>
<Action name="Get Information">
<Type>14</Type>
<Function>0</Function>
<DTIndentLevel>2</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
<FileInformationToCollect>0</FileInformationToCollect>
<Variable>%pdfversion%</Variable>
<FileName>%pdfviewer%</FileName>
</Action>
<Action name="Comment">
<Type>202</Type>
<Function>2</Function>
<DTIndentLevel>1</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
<Comment>If it is less than 5.0 it will jump to the label INSTALL ACROBAT otherwise dump and continue</Comment>
</Action>
<Action name="IF">
<Type>200</Type>
<Function>1</Function>
<DTIndentLevel>2</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
<Condition>%pdfversion% &lt; 5.0.0.0</Condition>
</Action>
<Action name="GOTO">
<Type>209</Type>
<Function>1</Function>
<DTIndentLevel>2</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
<Label>INSTALL QUESTION</Label>
</Action>
<Action name="ELSE">
<Type>206</Type>
<Function>1</Function>
<DTIndentLevel>2</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
</Action>
<Action name="END IF">
<Type>201</Type>
<Function>1</Function>
<DTIndentLevel>0</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
</Action>
<Action name="GOTO">
<Type>209</Type>
<Function>1</Function>
<DTIndentLevel>1</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
<Label>END</Label>
</Action>
<Action name="LABEL">
<Type>208</Type>
<Function>1</Function>
<DTIndentLevel>0</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
<Label>FINISH</Label>
</Action>
<Action name="Busy">
<Type>135</Type>
<Function>0</Function>
<DTIndentLevel>1</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
<Display>FALSE</Display>
<Text>Hide Wait Message</Text>
</Action>
<Action name="LABEL">
<Type>208</Type>
<Function>1</Function>
<DTIndentLevel>0</DTIndentLevel>
<Enabled>1</Enabled>
<ErrorHandling>
<UserNotificationMode>2</UserNotificationMode>
<CustomErrorMessage/>
<OnErrorAction>0</OnErrorAction>
<JumpToLabel/>
</ErrorHandling>
<Label>END</Label>
</Action>
</IR_ACTIONS_LIST>


