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Stuck on "Dismount Client Data"

I have tried unsetting the read only option and I've tried restarting my pc. For some reason it just won't finish this update, which also means I can't use the repair button, as that doesn't become clickable until it finishes. Any suggestions?
I also received the following error message the first time I tried to login (or something similar) and again just now. If I click ok it closes the launcher.