1/ When you get no message from Avast, what makes you even think it's avast fault in the first place?
2/ How can anyone try to reproduce and fix the problem with absolutely no information provided, like
- what kind of VPN
- are you installing any SW or not for the VPN
- which Windows version
- which avast product and version
- what does "doesn't let me access and install" actually even mean, i.e. what you expected to happen and what happened instead of that