Where did you get the 32-bit version? If you have the boxed set, the 64-bit version is on another disc in the box.
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.
Yes, just the download.
I'll see if I can find links to the 64-bit.
Found out that my online purchase list has a download link page which allows for selection of different versions.
Yay... problem solved!
Thanks for reporting on the ability to download the 64-bit version.