version 8.0.4 causing error

I just wanted to point out some issues I have ran into that need to be addressed. If you buy the PLUS version of this plugin and install it, it doesn’t show up in tabs for you to be able to access so its essentially useless. If you try to install the free version 8.0.4 you get a fatal error. So I had to install version 8.0.3 and also the PLUS version to get it to show up as a tab so I can access the plugin. Now I have wordpress telling me there is an update to 8.0.4 but if I try to update to that it throws a fatal error and both plugins dont work. It would be nice if I could just install the PLUS and have it work. Can you please fix this?

https://wordpress.org/plugins/css-javascript-toolbox/