Location of PGP 5.0

Where can I find a copy of PGP 5.0 which handles this "SHA1" hash extension, and the new forced incompatabilities? I'm looking for a Linux distribution. All I've found are Windoze versions, really old betas which break *everything* which calls PGP from a script or command line, and betas which have a lame expired timebomb in them. Source is prefered for obvious reasons. Any ideas? (Yes, I'm in the U.S.)