On the other hand... what have you to lose by installing both x86 and x64 versions of Reaper? A tiny bit of disk space? I'd rather have it and not need it as to need it and have to go online, download, install... configure... etc...
Just a suggestion... For example I have a few old DX plugs that do not work in x64. If I want to use them, I open the project in the x86 version and keep going.
D
|