cant uninstall free AVG from mac

Try this:

Remove un-installable software MAC

shut down and boot into safe mode

Use safe mode to isolate issues with your Mac - Apple Support

delete the application in your Macintosh HD/Applications folder

if found delete any additional components of the application in

Macintosh HD//Library/Preferences

Macintosh HD//Library/StartUpItems

Macintosh HD//Users/<current user>/Application Support

from the finder go to "Go"

hold down OPTION

go to Library in the drop down

if found delete any additional components of the application in

/Application Support

/Preferences

go to 

go to System Preferences

go to Users & Groups

click the active account

unlock the panel with your administrative credentials

go to Login Items

if found delete any additional components of the application by highlighting them and pressing the "-" icon.

then reboot normally.

As per this article https://support.apple.com/en-in/guide/mac-help/mh35835/mac

If an app isn’t in a folder or doesn’t have an Uninstaller, drag the app from the Applications folder to the Trash (at the end of the Dock).

Restart the Mac and empty the trash .

Second method -

Go to system preferences and click on users and groups open the pad lock by entering admin name and password ( in case if it is an admin account ) , select login items , if you see app select it and click on minus sign to get deleted .

In system preferences itself click on Security and privacy , click on Accessibility then privacy select the suspicious app click on minus sign to get deleted .

Click on finder and search in Applications and download folder . 

The next step would be enter in System Library .

Click on Finder , take cursor on top menu bar click on Go - Computer - Macintosh HD - Library 

You have to manually search app in some folders where they reside .

1.Application Support 

2.Caches 

3.LaunchAgents

4.LaunchDaemons

5.Logs 

6.PriviledgedHelperTools

7.Startup-items

8.Receipts

9.Preferences - the plist of app is to be removed , if there is com.apple .xxxx .plist it could also be com.apple.xxx.plist 

10.Extensions

11.Frameworks

12.internet Plug -ins

13.Input Methods

14.ScriptingAdditions

Then enter in User library ( click on finder and take cursor on top menu bar , hold option key and click on library ) .

Search in folders 

1.Application Support 

2.Caches

3.Cookies

4.Safari

5.Logs

6.Saved Application State

7.LaunchAgents

8.Internet Plug -ins

9.Input Methods

10.Preferences - com.apple.xxx.plist .

11.Containers are also to be checked .

Then again click on Finder - Go - Macintosh HD - System - Library - Frameworks - search the app remnants in Framework folder .

Right click on remnants from the above folders and move to the trash bin , restart the computer and empty the trash .

see this link:

Remove AVG

https://support.avg.com/SupportArticleView?urlname=How-to-uninstall-AVG-AntiVirus-for-Mac

the consensus and the findings on these forums are not to install an AV client on Mac regardless of any windows credibility the developer has. macOS uses it's own AV embedded in the OS and Apple does not share that information of how it works with developers, the result can often be conflicts between what macOS is doing and what the 3rd party app is doing.

Is there not an uninstall on the AVG application, or Help menu?