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OK, this is an installation issue. If you Install NPCAP first on it's own it registers and runs as a service. Then install Wireshark without NPCAP and the installation removes the NPCAP service and nothing will work.

Uninstall everything, install wireshark without NPCAP. Then download NPCAP and install it. Now wireshark works.

I'm installing this on Windows 10, version 1903, 64bit