Help Downgrading

Like the title says, I need help downgrading... I have version 1.01 of GTA SA right now that I had to buy after my computer crashed and I lost my old version. anyways I bought this one from Gamestop.com, its the download. when I get to the prompt that says to enter the directory I select 'next' and it tells me its invalid, so I found the correct directory and entered it in and it told me it could not patch it because its an unknown version.... so if you guys could maybe provide some insight on how to fix it or if it cannot be fixed at all... thanks a lot.

Someone close this I fixed it.

edit it and say closed

Requested.