My Vypr VPN still doesn't work, same Windows stop error 0x7F. But - WhoCrashed said before that an Avast Firewall driver was probably causing the crash - whereas this time WhoCrashed claims a driver belonging to OpenVPN ("tap0901.sys") is the cause.
My Avast build is 19.2.4186.429, which I guess is the newly fixed version. Upon everyone reporting back the good news of smooth sailing, I tried these steps:
Uninstalled my Vypr VPN service and app.
Installed the Avast Firewall component that I had uninstalled some days ago.
Manually initiated Avast to check for Program Updates and Virus Definition Updates.
Restarted Windows for extra good luck.
Reinstalled Vypr VPN, latest version (same version that originally participated in these crashes, though).
Attempted to connect to a VPN server: BSOD.
I ran the Avast Support Tool again, in case anyone will want this. Its file ID is UM5KX.