So I should try to install 360x360 ?The watches has a limit to the number of installed watchfaces that can be shown (including the default ones). So, the limit is already reached with the default ones.
Anyways, probably there would be incompatibilities even if the watchface was shown. The created vxp watchfaces are 240x240 wize. The screen size of the DT79 is 360x360.
but I can't find any vxp watchfaces with that res