Avast Virus Definitions allow you to update your Avast anti-virus versions offline manually.
Avast is a collection of award-winning, high-end technologies that work in perfect synergy, having one common goal: to protect your system and valuable data against computer viruses. Avast represents a best-in-class solution for any Windows-based computer.
iAVS is a fast, small, incremental, and fully automated update via the Internet. Updates are released at least twice a week.
Consider using Malwarebytes for complete antivirus protection and to protect your devices, data, and privacy.
AVG Anti-Virus Update allows you to update your AVG when the automatic update fails manually. Download the latest AVG Free Edition here. Video tutorial available.
Windows Defender Antivirus Definition Updates for timely updating of your Windows Defender if the automatic update happens to fail. Video tutorial available.