[Cannot upgrade server/client to 1.5.1]

Thanks for the reply! I forgot to mention that my buddy is running Tekkit for 1.5.1 on a Mac. So Tekkit lite for windows is 1.4.7, while for mac its 1.5.1? Strange right?

[Cannot upgrade server/client to 1.5.1]

Buddy just downloaded Tekkit Lite, and its running version 1.5.1. Was getting outdated server error. No matter what I do I cannot upgrade my Tekkit server or client from 1.4.7 to 1.5.1. Deleted everything on computer related to minecraft, still no dice. Cannot shake 1.4.7.

Any ideas/help would be appreciated!