I was also having this problem until I followed the instructions on this page: https://forums.x-plane.org/index.php?/forums/topic/140255-still-stuck-on-step-1-read-this/ Now things are working again and I can get past the OSM step. Hope this helps.
Hi, I recently purchased a used MCP Combo 1 and this was the trick to getting it to work with my PMDG 737NGX. Thanks for figuring out a workaround and posting it. Can you tell me if this will also enable me to use other modules like for the PMDG 747 or 777? Thanks again. Chad