lol not quite m8, i seem to remember that the Mask (creator of essentials) was in negotiation with Hasbro, as he did get official help previously from them while creating the 1.80 patch.
There is an instruction here - go to the newbie guide under the nascar heat sub-heading on converting your nascar heat demo to the full game (basically the difference between the demo and the full game is the carset, some tracks and features like the in-built skin painting bit), so unless you've got a nascar heat CD a good read thru there might enable u to set up the demo, convert it to full-ish spec for installation of mods.
best wishes .......... Wrighty