I believe the old Blender version with the DTS exporter was taken down. If you're most comfortable with blender, you may need to ask around a bit to find a copy with the exporter intact.
The only other official and commonly used dts exporter is found alongside Milkshape 3d v1.8.4. You can buy a registration key from
Chumbalum Soft.
There are no cracked/pirated downloads available for the most recent version of MS3D, so your only option is to buy it for 25 Euros.
You don't have to make your model in MS3D. The program comes installed with over 30 different imported file formats, so you can model in whichever environment you find comfortable, and then import it into ms3d.
I hope this answered your question or was at least helpful