The desktop apps broke after Adobe terminated their support of their AIR platform software. This has since been taken over by Harman, a subsidiary of Samsung. The desktop apps for Christian Chat depend on the AIR platform to operate. Both come with an older version of AIR integrated that no longer functions and so a 2 step installation has to be applied to get them working. Although they are no longer officialy linked to or supported by Roboop the desktop applications for both Windows and Mac are still available, therefore anyone can still install the desktop apps by doing the following:
Firstly follow the link to the AIR runtime installer and choose either Windows or Mac, depending on your system.
https://airsdk.harman.com/runtime
After installing the AIR runtime to your system, now follow the appropriate link from below for either Windows or Mac and download the Chat app.
https://christianchat.com/windows/
https://christianchat.com/mac/
After installing the chat app you should now be able to login on either platform.
PLEASE REMEMBER NEITHER OF THESE APPS IS CURRENTLY SUPPORTED BY ROBOOP AND YOU DO THIS AT YOUR OWN RISK.