Hi Golden What I would suggest you do, to keep completely within the EULA is to download both versions of the RC 7100 from Microsoft, but be quick as there is not much time left
You can run these legitimately until march next year and this should give you time to acertain which version x86 or x64 suits your systems best
When you have access to the official release you can replace one system with the official release but retain the other for testing purposes
In fact if you are only using the system for cross testing compatibility then the reduced functionality of the RC will stay working until next August.
Not ideal, perhaps, but perfectly legal