Cannot uninstall plugin nor view/edit other plugins

I installed this plugin to see if it would diagnose an as yet unspecified login issue as no users can log in to the front end of my site. I couldn’t find any help using this plugin but now cannot uninstall it. I cannot install or uninstall any other plugins now either. If I click on Plugins or Installed Plugins on my WordPress admin menu it always redirects me to the page mentioned in the link which is the Plugin Conflict Finder Options page.
Any help would be much appreciated, thank you.

• This topic was modified 7 months ago by Matt. Reason: added info

The page I need help with: [log in to see the link]