I just saw this thread and I wanted to give some context to the "solution". First of all it was indeed on a thread I started about an issue I had with activating the IXEG 737 Classic Plus on XP12, but the work-around was from @clecorouge. He has done some digging around and found this was a way he could see something happen other than a crash. Of course using the mac version of the plugin for windows should not be called a solution as it might seem to work, but i may not activate everything correctly as the 2 plug-ins exist separately for a reason. For me, for example, it didn't work at all.
That being said, the fact is that it should just work as-is and the IXEG-team and/or x-aviation team refuse to work it out because it's only 3 of us who had the issue (4 if we count the issue here as well), even though we offered to run stuff with debugging or extra logging so they can find the culprit. They should have a better idea where to look and we can only offer some cooperation.
So I am curious if you managed to activate it and them putting back the windows version for example. For me that didn't work either.