I had the AOS add-ons disabled
I had the Enhanced Proteted Mode unchecked
I had the Automated Configuration Scripts unchecked
I have tested both the upgrade and the clean install options.
Avast 2014.9.0.2011 does not let Internet Explorer 11 connect to internet on a Windows 7 x64 desktop via ADSL-modem.
There were no problems with the Avast 8.x
The only solution was to uninstall Avast 9.x and replace it with Comodo 6.x
Yet Avast 9.x does not prevent connecting to Internet via a GSM-modem if the AOS add-ons are disabled and Enhanced Protected Mode unchecked.
I am bewaiting the following release of Avast before testing any more.