I couldn't find any differences between AVG Anti-Virus Free Edition 8.5 and 8.0. Installing the latest version caused a Blue Screen of Death (BSOD) - Stop Error 7E avgldx86.sys on Lenovo IdeaPad S10 runnning Windows 7 Beta. After rebooting, it can't be uninstalled even in safe mode. The previous free version 8.0 works on the same netbook running Windows 7 Beta. In the end, I have to install Avira AntiVir Premium Version 9.
However, AVG Anti-Virus Free Edition 8.5 was installed successfully on Lenovo Z61t running Windows 7 Beta. The disappearing functions mentioned in previous post appear again after installation.