Well, i downloaded all the material for X8 and had no problem. I installed the last version of X8 and i am in the process of recording a video, again, without any problem.
Yes, it has both options, for 32 and 64 bits for PSP, but for the add-ons, i have not installed them yet. Older plugins and softwares only work on 32 bits, while some newer ones are only running on 64 bits. Since i didn’t try them yet, i could not tell you which ones would work on your machine. But you always have a 30 days money back guarantee if you really don’t think it is worth the upgrade (although i usually don’t care for the add-ons… just the program itself).