Installing apps fails - Cannot read property of 'url' undefined

I am having this message for all attempts to install or reinstall apps.
Firmware version 1.5.13

(I have not been able move to 2.x because alexa fails to distinguish “homey” from “harmony” and I also have several flows that use the microphone)

Any thoughts or help welcome

When/where exactly do you get this error? Can you post a screenshot?

Immediately in response to the install button

Looks like Athom have broken the app store for older firmwares. I guess all you can do is send in a support request:

In V2 your homey microphone can be used, only in default it is switched off, but it can easely be switched on in settings. The newer hardware versions do not have a microphone.