Is there a way to run a
[Code] procedure or PowerShell script in the Inno Setup compiler before the installation executable is generated?
You may get better answers, if you explain what you need to run the code for. Anyway...
One way is to compile the script on command-line from a batch file:
powershell -file precompile.ps1ISCC.exe setup.isspowershell -file postcompile.ps1
(or you can call
ISCC.exe from the PowerShell script itself)
Another way to run some script before compilation is using
Exec preprocessor function.
#expr Exec("powershell -file precompile.ps1")
If you need a GUI solution, there's ISTool, an Inno Setup extension, that has direct support for Pre Compilation and Post Compilation "Steps". But this project is unfortunately no longer maintained. You might be able to update it to the latest Inno Setup version, as it is open source.