Avast Free for Windows Vista

[NON]

Try using links from here: maybe offline installer is preferred.

@MartinZ

Installers for Windows XP/Vista:

https://install.avcdn.net/av/avast/iavs9x/avast_free_antivirus_setup_online.exe
https://install.avcdn.net/av/avast/iavs9x/avast_internet_security_setup_online.exe
https://install.avcdn.net/av/avast/iavs9x/avast_premier_antivirus_setup_online.exe

https://install.avcdn.net/iavs9x-xp/avast_free_antivirus_setup_offline.exe
https://install.avcdn.net/iavs9x-xp/avast_internet_security_setup_offline.exe
https://install.avcdn.net/iavs9x-xp/avast_premier_antivirus_setup_offline.exe