just found a way to install only avira antivirus without any bothersome apps
How good is the free version of Avira
Good free AVs - Kaspersky, Avira, Bitdefender (use one)
Good free firewalls - Comodo, ZoneAlarm (use one)
Good free second opinion scanners - Malwarebytes, Zemana (can use both)
Good free hosts/browser immunization - Spybot, SpywareBlaster (can use both)
Good free browser extensions - uBlock Origin, Ghostery, Malwarebytes Browser Guard, Avira Browser Safety, Emsisoft Browsers Security (can use some or all)
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I guess there are quite a lot of people who stopped using Avira Antivirus because of vpn, software updater, system speedup etc that are dropped during installation without any approval from users.
They used to provide an installer just for users who want their Antivirus only but that seems to be gone from their official website.
However I just found out that Avira still DOES offer an (offline) installer for Avira Antivirus only.
(Note: The installation itself can be done offline but the registration process after the installation requires internet connection)
Source: https://support.avira.com/hc/en-us/articles/360003441497-How-do-I-perform-a-silent-command-line-installation-of-Avira-Antivirus-
basically the link for the Antivirus installer is https://download.avira.com/package/antivirus/win/en-us/avira_antivirus_en-us.exe
Hope this information could be useful for you guys