I just upgraded the CoverArt plug-in to version 18.104.22.168. However, I couldn’t upgrade from version 22.214.171.124 (the Upgrade button was ghosted). To upgrade, I first had to roll back to version 126.96.36.199.
I doubt it matters, but I also have the following plug-ins installed;
Chocolate Theme 0.1.2.0 (in use), Diamond Theme 0.3.4.0, IBN People Provider 188.8.131.52, MediaInfo Provider 184.108.40.206.
There is a known bug in configurator which allows you to install CoverArt versions intended for Titan beta. This will be fixed in Titan. The latest version usable in Draco is 220.127.116.11