Thought that may be the issue, but did not want to assume or speculate. The Route Description features this in bright red letters... This item is for Trainz: A New Era ONLY.
Upon purchase, a version specific warning/message pops up, and it is done for a reason too. I do notice on your timeline, you have TANE. Is it still installed?? Otherwise, you may have to replace the faulty assets with something more suitable. While I didn't have any errors in TANE, I switched out the billboard trees for 3D ones.