“plugin” broke my entire website

after i installed this “plugin” (im not sure i should call it a plugin since last time i checked they are NOT supposed to break websites) all the links in my website broke, i get the “Not Found The requested URL was not found on this server.” whenever i click on a link and “Updating failed. The response is not a valid JSON response.” whenever i try to edit the page with DIVI.

I already deleted this awful plugin (I’ve had computer viruses that have caused less damage) yet the issue is still happening, how do i fix this?