Newest Update is not working

I updated SEO Squirrly on one of my client’s sites. Now it won’t work and even the Squirrly icon isn’t there in the side menu. I checked one of my other sites that I haven’t updated and it works fine. I even tried to uninstall and reinstall it and still nothing. Now I can’t even login. I took screenshots so you can see what I mean.

https://summerschools.uale.org/wp-content/uploads/2017/07/Squirrly-1.png
https://summerschools.uale.org/wp-content/uploads/2017/07/Squirrly-2.png