Originally Posted by Loeffel
Strange, I installed it on Callibre 0.7.48 but I got no cover option. :-( I tried to update to 0.7.49 after this nothing changed. So I removed the plugin, but reinstalling wasn't possible. Everytime Callibre says it is no zip-file.
It has to be a zip file. Redownload the plugin and make sure your browser isn't unzipping it for you. If your browser is unzipping it try another browser.