I don’t know which Broadlink Manager you used (there are several versions around the net). As for Windows I did install Broadlink Manager according to this guide (and used the download link in there). Works flawlessly and learning IR commands is a breeze.
Note that I use Broadlink Manager on Windows (under Python) which is not on the same device HA is running on.
Edited on 22 June 2023: Above link is not valid anymore. The very same guide mentioned above can now be found here.