Hey @Mathiassn ,
So there are two ways that you can run the core libraries from command line. If you have installed a system Python directly from python.org and then run:
pip install lbt-dragonfly -U
… as you see mentioned towards the bottom of the SDK docs page, then the command you have there will run as-is.
However, you can also run the core libraries using your own Ladybug Tools installation. For this, your command above should look like the following:
"C:\Users\[USERNAME]\ladybug_tools\python\Scripts\honeybee-radiance.exe" translate model-to-rad-folder model.hbjson --dry-run