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You probably could do it under one OS, but that would be alot of work.
Get the game running at the old version you want, save all version/folder relevant registry entries.
Install, get the game running in another folder at 1.5, save all version/folder relevant registry entries.
Import the reg for what version you want.
Gamespy, all seeing eye, and any other external game launchers will only point to one directory or another.
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