I've done it many times before.
by "dongle" you are talking about the special USB programming cable... right?
You should first check that you have the required COM driver... FTDI, version 2.8.14.0 (or later)
This page has information about the process, with video tutorials:
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LoginKey things to remember... only have one DMX controller connected at a time to avoid changing the address for ALL controllers, you may need 12v power applied to the controller for the program activity to work (unsure at the moment...), you can read the current channel setting to first test connectivity.