The only version available via your Cloud subscription is CS6, which is 64bit
If you already own CS4 or earlier you may install that version (CS5 is also 64bit)
If you own CS3 or CS2 you will need to follow the instructions below
CS3 and Acrobat 8 activation server is retired see reply #1 https://forums.adobe.com/thread/2372929
-you MUST use the special serial number AND the special installer you download, not your originals
-above includes a link to get the special version AND links to help with activation problems
-more information on activation problems with the new version https://forums.adobe.com/thread/2385900
CS2 + Acrobat 7 + Audition 3 (AND EARLIER) Activation Server is gone, so read below
https://helpx.adobe.com/creative-suite/kb/cs2-product-downloads.html?promoid=19SCDRQK
You MUST use the special version and serial number on the page, not your original disc or serial number