If you kept the original demo download all you need to do is download the patch for the demo see http://www.amigafuture.de/forum/dl_details.php?view=detail&id=127&cat=2
I have been meaning to give the demo a try again since spotting the patch as if the control issues have been fixed it looked quite promising.
If I remember at the weekend I will give it another try as I really wanted to like Desert Racing as we don't see very many new original tittles on the Amiga of late but, the game just wasn't any fun.
Sam440ep 667mhz, 512MB, 120GB 2.5" HD, OS4.1FE
WinUae 3.0.0, OS 3.9, BB3, Catweasel MkIV
Amiga 1200, Blizzard 040/40 (BlizzardPPC 060/200 with SCSI removed at present), mediatorSX pci, Voodoo3, PCI network card os 3.9BB2
4MB Minimig with ARM addon boar