Well you can do a fresh install, then copy the entire contents to another folder then you can patch each one the way you want.
maybe have to patch the first install to 1.2 then copy it then patch the original to 1.3A.
For which one to use as default for patching you must change the folder in the registry.
maybe have to patch the first install to 1.2 then copy it then patch the original to 1.3A.
For which one to use as default for patching you must change the folder in the registry.