It doesn't matter ^^
CLS-SREP will decompress srep data no matter which version of srep you use for compression.
Make sure you use the latest version of CLS-SREP. I'm assuming you're using ProFrager's version and not Razor's version. The latest CRCs of those files are:
Code:
File: CLS-SREP_X64.EXE
CRC-32: ae1cd4f0
File: CLS-SREP.DLL
CRC-32: d30b67ba