AVG Free Edition - Invalid signature when updating virus database

General discussion
1

Hello Nicolas,

I understand the inconvenience.
I am not sure about the CSS file that you mentioned in the description but for this update issue, it is necessary to perform a reinstallation of AVG Antivirus program.
For uninstallation, refer this article: http://avgread.me/1DEtNP0 .
To install AVG Antivirus free, follow the steps as mentioned (here).
Keep us informed about the status.

2

Hello Nicolas,

I understand the inconvenience.
I am not sure about the CSS file that you mentioned in the description but for this update issue, it is necessary to perform a reinstallation of AVG Antivirus program.
For uninstallation, refer this article: http://avgread.me/1DEtNP0 .
To install AVG Antivirus free, follow the steps as mentioned (here).
Keep us informed about the status.