I installed draw.io plugin with a trial license for a self hosted confluence beginning of this year, to compare it to gliffy, which we were/are currently using. It went well and I decided to switch plugins when our license is extended (october). For the time being I left draw.io installed, but we didn't use it.
I probably should have deinstalled it, because now I have the problem that in plugin admin page it says draw.io is outdated, but the update button doesn't work and the detail page does not open either, so I can't even deinstall it. Even when i search for draw.io in the marketplace and click on 'buy now' nothing happens...
Any ideas?