WSOD – without theme och plugin conflicts

I have updated both WordPress and ai1ec to the latest versions. 4.0 and 2.15 respectively for toarpsmissionskyrka.se. But when activating ai1ec I get the white screen of death for the admin panel. My front end site works fine, well except for the calendar…

I’ve searched the forums and found the troubleshooting guide: http://time.ly/document/troubleshooting/first-troubleshooting-step/

And I’ve tested for both plugin conflict and theme conflict and neither applies. The problem persist even with all plugins disabled and it didn’t help to switch to Twentythirteen nor Twentyfourteen.

I’ve also seen the advice to check the box for Skip in_the_loop. But how do I do that when I can’t activate the plugin without being faced by the White screen of death?

Any help is very much appreciated!

https://ww.wp.xz.cn/plugins/all-in-one-event-calendar/