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Wireguard "Manager already installed and running"

This is a weird glitch in Wireguard that mostly seems to occur when Wireguard has been improperly shutdown or shutdown during the connecting fase. It only seems to happen on Windows devices as well.
To fix this, do the following

  1. Go to Services
  2. Find and select the service Wireguard Manager
  3. Restart the service

Another option is just to restart your computer.