Removal of Avast and reinstallation

I can’t remove all of Avast so I can reinstall it. Most of the Avast is gone so the un-installer is gone. I tried using “Easy Find” and got rid of some more of the files but when I try to reinstall I get “Avast is already installed, please uninstall the previous version first.”. I have went to ~/library/application support and deleted all files but still get the same thing

Here are the instructions from Avast.
https://support.avast.com/en-us/article/Uninstall-Mac-Security