Could it be that there is some kind of bug where if the compressed block size is too large, all SREP versions will fail because of this? In principle, not v3.2, but is it possible? Maybe trash all "cls-srep.exe" and use the native "SREP.exe" file for unpacking.
Code:
[External compressor:srep]
header = 0
unpackcmd = "srep" -d -s -ia- <stdin> <stdout>
I remember some "-s25gb" switch, from older posts, whether it was used for SREP or FreeArc, I'll pass on that now.