Worked in private lobby for all I care. If it doesn't - don't hesitate to post in comments your bug report (with condition: what you modified, game mode, lobby, etc) or inform me any other way you see fit.
Kudos to @doobiedoo for 5.1 patched exe, you can find it here: viewtopic.php?p=388235#p388235
Thus I can be relieved from this "duty" untill futher notice.
Since topic is easier to find and requres less time to manage, I'll post my patched exe here. So that being said, here is what've "accompleshed" so far:
previous patches (till 5.0)
[Link]
[Link]
[Link]
[Link]
[Link] (why do ppl still downloading this one - no idea)
What does it do? Well, nothing new here, removes .cache file check and eac presence check.
"Installation" steps:
1) download exe, provided by the "link";
2) unpack it to your Space Marine 2\client_pc\root\bin\pc\ directory
3) dowload "start_protected_game.exe" from this post: viewtopic.php?p=369349#p369349
4) place it in your Space Marine 2\ directory
5) don't play pvp with cheats
And that's it.