When launching FAF, the launcher gives an error

When launching the launcher, this window constantly appears

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Uninstall, manually delete the relating files from C:\Program Files, reinstall.

Your update failed for some reason and you have a mix of old and new files. This happens a lot.

"Nerds have a really complicated relationship with change: Change is awesome when WE'RE the ones doing it. As soon as change is coming from outside of us it becomes untrustworthy and it threatens what we think of is the familiar."
ā€“ Benno Rice

I have already deleted absolutely all the files I could find

I see it is installed to D:\FAF-Client and not C:\Program Files

make sure to delete the whole faf-client folder after uninstall

"Nerds have a really complicated relationship with change: Change is awesome when WE'RE the ones doing it. As soon as change is coming from outside of us it becomes untrustworthy and it threatens what we think of is the familiar."
ā€“ Benno Rice

I deleted game files from everywhere by searching for them. Is there some kind of uninstaller for the client?