I wanna switch between 0.25 and 0.2a but the Iso data is only being recieved to 0.25(my default emu).How do I make it to where 0.2a plays the iso game instead of the other and vice versa?
Just make sure that v0.2a has the same configuration as v0.25 (check the options of the emulator) and that you extracted v0.2a in a new folder when you downloaded it. It will work.
As a side note, if you're trying to make v0.2a work on Windows 2000 then you're out of luck. v0.2a (and earlier versions) cannot boot games on Windows 2000, they work only on Windows XP/2003.