Deleted old transients and Yuzo stopped working

After deleting transients Yuzo disappeared from the Admin panel completely. I thought a reinstall would help so went to plugins to add new, searched for yuzo and it said I already had it installed. I then used ftp and moved the plugin folder to a temp folder. It matter. Couldn’t reinstall Yuzo as still saying I already had it.

I would like to remove all Yuzo code from my website. How can I do that? I have 400 odd pages that have now lost all prominence in Google search due to this so not very happy. I was using Yuzo to build extra content on specific pages so now I am under the word limit for good SEO hence I have lost all positions.

Immediate help would be appreciated. The site in question is (www.bigears.net.au).