Miracle, the Milviz Pilatus finally works after the third installation, only because, i think, i cut really off all antivirus before installing (all avast programs and Windows defender firewalls). Before i had not messages from these antivirus during the first two installations. I believe the antivirus program is playing weird things with the DRM WASM helper program of Milviz ! So far, it works for this wonderful aircraft. 