Inno setup, How do I check for an app and set install directory based on it?

Posted by JustSmith on Stack Overflow See other posts from Stack Overflow or by JustSmith
Published on 2010-05-21T22:43:34Z Indexed on 2010/05/21 22:50 UTC
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inno-setup

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windows-registry

I'm installing an extension to an application and it needs to be copied into the same directory. I want the setup script to look to see if the app is installed by checking for it's register key and getting its installed directory and set the install path that is shown to this path.

My questions are:
Can I check a registry key with the installer before they user gets to the directory selection screen?
If I can how to I change the text in that box?

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