I just purchased the $449 Acrobat Pro 2020 Is there a 64-bit Acrobat Pro 2020 platform?

Australia and a couple other countries have access to a 64-bit version on the Windows platform, but it has not been made available to the rest of the world yet. Everything on Apple is now 64-bit, as the Apple OS no longer supports 32-bit programs.

Don't think So. In some countries Acrobat DC has a 64 bit version. But there is really no advantage for 99% of people.