Problem to setup Sync

I am working with Devonthink Pro Officeon a MacBook Pro as well on a new iMac. Everything works well on the MacBook Pro, also the Sync works fine.

Now I wanted to sync the data with the iMac. But I can not come along how to setup the Sync. No chance to add something… it looks like this:

Thanks a lot for any hint

I would suggest downloading a new installer from here:

And potentially rebooting the machine too.