Carsten,
We appreciate your efforts in trying to fix the issue. This invalid file signature error will get fixed only be re-installation method. Go to Control Panel -> Programs and features -> Uninstall -> Uninstall AVG Internet Security , restart your device.
Refer this article: http://support.avg.com/SupportArticleView?urlname=Download-and-install-AVG-AntiVirus-Internet-Security-or-Premium-Security to download and install AVG Internet Security.
Once the installation gets completed, open Internet Security -> My AVG -> My Subscription -> enter your license number to activate it.
No automatic update of virus definitions the last 8 days. When attempting manual update the update is interrupted with the following error message ( my translation): " Invalid file signature. The setup will be stopped".
The same happens when I try to manually update the program.
I have a paid version of Internet security where the subscription continue until 2019
Carsten,
We appreciate your efforts in trying to fix the issue. This invalid file signature error will get fixed only be re-installation method. Go to Control Panel -> Programs and features -> Uninstall -> Uninstall AVG Internet Security , restart your device.
Refer this article: http://support.avg.com/SupportArticleView?urlname=Download-and-install-AVG-AntiVirus-Internet-Security-or-Premium-Security to download and install AVG Internet Security.
Once the installation gets completed, open Internet Security -> My AVG -> My Subscription -> enter your license number to activate it.