An option might also be to call up on SM asking them to send a Patch or a update that removes the Internet activation on the 11.1 versions for those who encounter very hard issues activating the new versions. I think if one explains the situation to them they might be willing to do so. So Poser 11.1 could be used as Option or older release just like all previous Poser versions

On my side I still have em all running since Poser 4 and they all work like a charm

It is actually as far as I can see just an small update on the Poser.exe Nalpeiron Interface productactivator_nsl.cpp NSLTestConnection ProductActivator_NSL:CheckLicense

this option would not affect the 11.2 update as this version overwrites the Poser.exe again and Rendo could keep the call home Option for their future releases.