I believe the license travels with the .hipnc file. So if you submit a .hipnc to a render farm you will get watermarked output.
If you visualize your fuel you will see that is not burning quickly enough. As long as the fuel exists combustion will occur. Try to find a way to either emit less fuel or burn it more quickly.
Change the Source Volume from Add to Copy then loosen up the drag on the particles..
There is an example file of a deforming fracturing mesh on the Tokeru
] site. Maybe it can help?