Truck Simulator Ultimate DLC Not Working—Paid Content Won’t Activate

I purchased a DLC in Truck Simulator Ultimate, but I can’t use it at all. No matter which truck or car I buy, the DLC doesn’t work. I even deleted and reinstalled the DLC multiple times, but the issue remains.

I paid for this content, yet I have no way to access it, and there are no clear instructions on how to activate it. This is incredibly frustrating! I also attached a screenshot, but still, I can’t figure out how to make it work.

Truck Simulator Ultimate, please fix this issue immediately! I either need a working DLC or a full refund. Paid content should function properly, and players deserve a real solution!