Update problem (both of auto & manual)

[innocentone]

Yes, I can access other websites.

[Lisandro]

Do you use any other antivirus in your computer?

Can you try to repair your installation?
Go to Control Panel > Add/Remove programs > avast! antivirus > Remove. Then choose Repair function in the popup window (Repair).
If this does not help, can you uninstall / boot / install / boot again?

[Forejt]

This problem is already fixed with version 4.8.1282 and higher.
Uninstall avast in safe mode with aswClear:
http://www.avast.com/eng/avast-uninstall-utility.html
Then restart and install the latest version. The green download.com link on our site still has old version, so download setup directly by clicking on the black download link below.

[innocentone]

Thank you very much for your guidance! Now it can update already~ 

[Lisandro]

The green download.com link on our site still has old version

Please, ensure this won't happen again...

[DavidR]

That is surely up to download.com and not avast, of course they could remove the download.com icon link, but that would mean someone would have to monitor the version on download.com to ensure it is the same as the current one.

Personally I don't know why they have the link (save bandwidth perhaps) but it is also only the English version of avast at download.com.

[Lisandro]

I understand, but it's ridiculous that starting from avast site (even redirected), the user does not get the latest version...