Potential problems after migrating to W10 pro?

I’m thinking to get a W10 pro key. Is a complete re installation of MSFS is needed after the migration as W10 will only be updated ?
Thank you for comments.
Best regards

If you upgrade then no.
Even you did a full reinstall you don’t need to download the whole 100GB. Just move the files somewhere if you downloaded to the default download folder or leave them where they are.
Then when the game first launches point it to the existing files. It will detect them and will not re-download.

You only need the small install from the Store.

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