When I test my setup.exe file I get the following error message:
This program cannot be installed on Windows NT Version 5.1.2600 Service Pack 1 or later.
Why is this happening, I am running Windows 8 Dev Preview too. Could that have anything to do with it?
Sounds like you’ve got an OnlyBelowVersion directive in your [Setup] section that is limiting it.
From the InnoSetup documentation:
From http://www.jrsoftware.org/ishelp/index.php?topic=setup_onlybelowversion