I am facing a problem running older versions of Xcode on newer MacOS versions.
For example, Xcode 13 on MacOS Ventura.
The solution is very simple. If you have the older version downloaded in your Applications folder for example, lets say 12.5.1
version, you just need to:
/Contents/MacOS/Xcode
, so the full command will be something like /Applications/Xcode-12.5.1.app/Contents/MacOS/Xcode
Now you should be able to run it. You will note that when you open this version of Xcode, the Terminal will open too, but don't close Terminal because it will close the Xcode too.
Here you can find older Xcode versions.