I had the same problem in the previous WU and in this SU, I was not able to trigger the update from the MS store app, rebooting, using Power Shell scripts, etc., nothing was working, so here it is what I did to update MSFS:
With the MS Store version and a custom installation path I was able to update MSFS by uninstalling it from the app settings (it says that the documents will not be touched).
When the process is complete you can check in the custom installation path that the community and the one store folders are untouched, and all the heavy files are still there.
So when you install MSFS again it’ll download just a couple of GB from the MS store or Xbox app, then you start MSFS (you’ll see in the top left corner that the version is update) and it’ll ask to download again 100+ GB, but you only have to point the installation path to the previous custom one that has still all the old files, so it’ll check again for the updates and it’ll find the updates for the new version that in this case are around 8GB.
That’s it, it’ll work without any problem for the MS store version with a custom path, it’d be needed to check if the same is happening (if it will not delete all the files) with a default installation path and with the Steam version but I can’t test it.
I hope someone will find it useful.
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