Hi @dennisshepp,
I’ve moved your topic into Performance & Graphics as this category is for installation issues.
On the 2nd PC you are installing on, assure that the MS Account for it is the same as when you bought MSFS. In your Account online with Microsoft, there are listed devices that you own. If you don’t see it listed, it means that the PC you are installing on isn’t registered with them. They only way that happens is by using your same MS Account on that PC.