@raygulick You should be able to reinstall WF via Add new plugins. Sometimes, if you removed plugin using ftp; that means there are still data hash(es) in the database and when it tries to reactivate WF the hashes do not match (anything).*
Also try making a clone/stage copy of the site. Check the wp-config file in your root. WF uses a Constant define('WFWAF_ENABLED', true) which of course, may be set to true False will disable it… there are “many” Constants WF writes to wp-config.php so be sure to examine and maybe comment out any.
Also TRY (this) FIRST: add WP_DEBUG to create a log. Then use your FTP to open and read any errors. To get full results with WP/CP errors logs use this in the wp-config; but don’t forget to remove when done (log will be in wp-content folder as “debug.log”:
*Maybe try, load Better Search And Replace plugin to find any instances of WordFence that may contain meta and see how many returned results you get. This will at least tell you there is old data in the db.
From a Google search, this seems to be something we’ve inherited from WP. So I don’t think it’s a plugin issue. I suspect something has corrupted your CP installation. I would first try re-installing the plugin-install.php file. If that doesn’t cure it, then you could try its whole folder or even re-uploading the whole wp-admin folder.
Seems like your best route is to install a brand new instance of CP and then start adding plugins, one at a time, saving WF for LAST. Maybe try loading new instance in sub domain just to be sure you are somewhat isolated from the current instance.
Maybe export your blog xml so you have some data to run but I’m thinking your host has a virus in a close by directory on your shared drive; or the PHP version is not fit for CP.
OK, I found the issue. It was an error being thrown by Stop Generating Unnecessary Thumbnails plugin. I thought I had disabled it and several others, but in reviewing plugins for possible conflicts, noticed it was not disabled; had to try 3 times before it disabled. Once done, plugin ‘uploads’ and ‘add’ are back to normal.