Hey everyone.
If you have accidently updated or have updated and want to change back to 1.4.5, I have a download link for you.
Link removed due to Minecraft Terms of Service violation
Instructions for installation: (Windows)
1) Locate your .minecraft folder (Hit start then type in %appdata%).
2) Enter your .minecraft folder.
3) Enter the "bin" file and delete/rename the .jar file "minecraft"
4) Drag your new file (Downloaded File) into the bin folder.
5) Close and login into to minecraft (Don't re-update).