I need to install the Direct Test Mode App to validate the direct test mode running on a custom board. On the version 5.1.0 of nRF Connect for Desktop all app installations fail immediately with a nondescript error:

I need to install the Direct Test Mode App to validate the direct test mode running on a custom board. On the version 5.1.0 of nRF Connect for Desktop all app installations fail immediately with a nondescript error:

Thank you for confirming that it worked. I will inform the developers that this has resolved the issue.