App won't install

[Eternity-again]

As suggested, I removed the App (frist deleted the devices, secondly deinstalled the App, PTP) but after a cold reboot I get an error when installing the App again.

Tried both the App store and GIT zip versions. Also tried various platforms (Win, Mac, Android, Chrome and Safari).

After 2 weeks I requested support from Athom as it could also be a Homey issue (other Apps do install, this doesn't), but they can't offer any help, other than contact the developer.