MSFS making me reinstall even though its downloaded

Heya,
Today I open the sim and it promts me with the install screen:


But I already have the sim downloaded:

I tried selecting the folder where my game files were already in, it said “Checking for updates” and then it still said 160gb/210gb.

How do I fix this??

This Support Checklist may be some help.

https://flightsimulator.zendesk.com/hc/en-us/articles/4407168022418-How-to-get-past-the-Checking-for-Updates-screen

Z:\Games\Microsoft Flight Simulator_1\Content
“Content” folder contains MSFS launcher files, not MSFS packages. You need to find the “Official” folder.

Also, you need to look in the small box at the lower right hand side of the MSFS window, where you will probably see that the target destination for the whole installation is not the same as the actual installation location on your PC.
By clicking on the box, you will be able to navigate to the correct location and the message will disappear.

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Search for UserCfg.opt on your C: drive.
The last line states where FS2020 is installed.