Downloading the launcher from the official mojang website and trying to run it shows the following error
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Not sure what it was but restarting my computer seems to have fixed it... for now. There has been a bunch of issues with the launcher lately.
Please FIRST ensure you don't have any other versions of the Launcher running (e.g. the "Legacy" launcher, with the grey icon on PC);
if that's confirmed and you try again and it still doesn't work, open you task manager and end any/all minecraft launcher processes you see open there.
Please try these steps and report back whether either of these addressed your issue.