this is why after i install a forum i always leave the zip there so i can move it around to another folder and install another one etc.
i also keep copies of versions of mods etc on my hd in diferent folders.
these folders are then manualy backed up every once in a while to a second hard drive
i recomend everyone does something similar
it might be messy but at least u have them incase u cant find them elsewhere
but yea i think alot of people dont notice the archived releases
i hope my idea of keeping copies of things like mods and such help you and others