Hi guys, I'm using the recent version of Sigil (0.9.7), and I tried to install KindleGen 2.9 plugin via Sigil > admin plugins > install plugin > zip. But Sigil says that this plugin is not an valid plugin. What to do?
PS. I have Python 2.7 already on my computer.
PS 2. I was able to install FlightCrew without problems.