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Windows 10 October Update (Feature Update version 1809) Causes Npcap Problems #1416
Installing this Feature Update (which I currently got by manually requesting system updates, but will likely roll out to everyone soon) caused 2 problems:
These are unfortunately the same problems caused by the April update (see Issues #998 and #1216 ). The current solution/workaround is the same too--either reinstall Npcap (preferably downloading the latest release from https://npcap.org first) or run FixInstall.bat as admin from the Npcap program directory (normally "C:\Program Files\Npcap") Or re-run the Npcap installer (preferably downloading the latest one first from https://npcap.org).
We should figure out what to do before it becomes a bigger deal as hundreds of millions of Windows systems start receiving the update automatically. The best solution would be figuring out why this happens and preventing Windows from doing it. But the second best might be running an application at system start which checks that Npcap is OK and runs FixInstall if not.