The previous posted download links for Safari 6.0.2 don't require a dev account or any sort of authentication to download for. They are public and anyone can download? Aha, I think what may have happened (and I've seen this happen for long links posted on these forums) looks like a space was inserted in the URL!
So copy and paste the URLs in TextEdit and search for spaces and remove them.
The links are derived by interogating the software catalog that 10.7 and 10.8 machines use for Software Update. Except I notice now that 10.8 uses https vs. 10.7 using http, so I will modify this command so it works on both:
curl $(strings /System/Library/PrivateFrameworks/SoftwareUpdate.framework/SoftwareUpdate | grep http | grep sucatalog) | grep Safari6 | grep pkg
So... run this in Terminal on a 10.7 machine and strings will find the URL Software Update: http://swscan.apple.com/content/catalogs/others/index-lion-snowleopard-leopard.m erged-1.sucatalog, then has curl download it and grep for the string "Safari6", then only those with "pkg" in them
http://swcdn.apple.com/content/downloads/49/44/041-8709/a8wz12kl2lfw6574aeff3gsd e8twub3z7x/Safari6.0.3LionRepair.pkg
http://swcdn.apple.com/content/downloads/49/44/041-8709/a8wz12kl2lfw6574aeff3gsd e8twub3z7x/Safari6.0.3Lion.pkg
On a 10.8 machine you'd run the same command, but it'd be looking at a different catalog: http://swscan.apple.com/content/catalogs/others/index-mountainlion-lion-snowleop ard-leopard.merged-1.sucatalog
However as of this post only the Lion packages show up?! Safari 6.0.3 should be included in the 10.8.3 update, so a standalone update pacakge release may or may not happen, if someone is having trouble the usual recourse is to run the Combo Update.
Oh and as far as reverting goes, this can be done but only to the previous version so if you have 6.0.2 you can only go back to 6.0.1 (if it was backed up on previous install): Restore previous Safari version from .SafariArchive.tar.gz - Mac OS X Hints
My advice though, is to keep moving forward, Safari has had its fair share of bugs that have been fixed in each release, security be a notable area and these days defense on the Internet is important!