So last week I downloaded the upgrade for Lightroom to version 4.3. Try as I might, I could not get it to install on my Vista 64 machine.
After doing some research, I found out that it was because of Firefox. I don't know why, but downloading from IE9 and running the program from IE worked! Running it from Firefox does not let it work!
Just thought I'd share in case other people have the same problem.
