Avast antivirus is the best security software and to allow a program via Avast firewall, you will need to open the Avast user interface and go to Protection > Firewall. Now, click on Application settings at the bottom of the screen. After that, click on the New application rule and choose a group and then, click, locate, and choose the executable file of the application which you want to add. Call on Avast UK to get connected with the technical experts for instant help. avast helpline number uk