If you get stuck on the Checking for Updates screen, our first suggestion is to go through these three Zendesk Articles to help yourself troubleshoot through potential issues:
https://flightsimulator.zendesk.com/hc/en-us/articles/4406039624338
If you are still stuck, please create a Zendesk ticket to work with Support or you can make a new post here if you would like help from from fellow community users. Cheers!