github nmap/npcap v0.05-r13
Npcap 0.05 r13: Fixed the driver signing error in Vista

Vista users should be able to install Npcap driver normally now.

For Win7 x64 users:
If you still get the pop-up window that said Windows requires a digitally signed driver (or get error 577 when executing net start npf), please try these steps:
1) Install the following update patch successfully. (Windows SHA-256 certificate security)
KB3033929 for Win7:
This step should requires reboot.

latest releases: v1.55, v1.50, v1.40...
5 years ago