Hi,
Yes, Lightjams can control any DMX fixtures, even in the trial mode. For this Stariville, you can use it with the 432 channels mode. Make sure to configure your fixture physically to be in the 432 channels mode. Then in Lightjams, add 144 generic RGB fixtures and select one of the ArtNet universes. If you prefer, use the matrix tool to add a 12x12 matrix of generic RGB.
To configure the ArtNet settings, go in the view/configuration and then under the ArtNet tab. Make sure the proper network adapter is selected for output.