I am getting this alert in WordPress
All Premium Plugins and Themes Installer
You have version 1.7.0 installed. Update to 1.8.0.
When I agree to install, it says it has happened but then the system reverts back to asking for the upgrade.
My TinyMCE interface isn’t working, is that because of this?
Not sure about the TinyMCE issue but the 1.7 to 1.8 issue you reported should be resolved now. If you update again, you should not get the repeat prompt.