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Not entirely certain what's gone wrong there, but I would suggest the following as a recovery:

  1. Close all running Wireshark instances, and anything else that might be using npcap (e.g. nmap), even better to reboot.
  2. Uninstall any installations of npcap and WinPcap you find in the list of installed applications.
  3. Reboot.
  4. Ensure there are no installations of npcap or WinPcap left in the list of installed applications, if any found, repeat from step 2.
  5. Install the latest npcap from their website, currently 0.996.