I've received a reply from ZTorm support:
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So apparently there is a problem. I have not been able to get the POD purchased HOI2 to work yet, but if it will be fixed then I can wait (I have been able to acquire the game through other means, without having a gulity conscience since I have bought the game anywayOur technicians told me that XP 64 is not fully supported yet. But they are working on fixing those issues. At the moment I cant give you any estimated time on when this fixes could be implemented though ...