This is very useful input!
We will correct the dead-links. The one you provided should be OK.
The command should be executed in a terminal / command prompt. On Windows, you can open this by clicking “Start” > search for “cmd” and open “Command Prompt”.
You are also absolutely right that this transformation could be done by the MIC platform so that we wouldn’t have to transform it. PEM is usually OK, but in this case the MQTT library used requires DER formatted certificates. I will se what can be done about providing different certificate formats directly in MIC.