The CPU-Z error does not influence BenchMate. I guess you just have installed the very old CPU-Z version within wPrime by using the "Install Missing Libraries". You can undo that by deleting the CPU-Z* files in the wPrime directory.
As for the memory size error: That sucks and should not happen. I think your case is a good reason to give you access to an early prerelease of BenchMate 0.11: https://www.overclockers.at/downloads/projects/BenchMate 0.11-big.exe
Btw, SuperPi + Auto Minimize should work correctly as well.