My work system was recently updated to WE 7 and I just found out that PE 10 (32-bit) won't install on it. I need to get the 64-bit version. Where can I (download?) that from or do I need to get the PE 11 updated version?
Do you have the download, or physical media (DVD's)?
With the latter, you should have both the 32-bit and the 64-bit, just as Steve points out.
With a download, you might only have one version, and will need to go to your Adobe Account, and find your download links there, then download the 64-bit version. Never having done a download, I can only guess here.