Click on the bottom where it says, "Read more about this resource...", and you will be brought to the download page.
I got it to download however it only worked for a couple of the vehicles
Regarding modding, for ITF, I can not offer assistance, and I don't play the game myself, although I'm sure with updates that have happened to the game and changes could have affected some of these files. If something has changed in the past few months, it would be up to the mod creator to update their mods to fit current vehicles or changes.
