ProPresenter 6 is a 32-bit program, so it receives no direct benefit from running in a 64-bit version of Windows. However, you may see a general performance boost by running the program in this environment as the computer itself can support more RAM which means there are less things competing for the same limited resources on your computer.
ProPresenter 7 is a native 64-bit program. A 64-bit version of Windows is required to run ProPresenter 7.