The warnings is normal if the drawing have been inside Pro Platinum, typical it can be Acis objects, and DL dont have that.
Also i dont have DL 2017 on this machine, so i open it in Expert 2017, get the warnings but just click OK, render works fine, but of course i dont have your material, so ...
Anyway, i saved it as an jpg as is, see attached
Have you try'd to open a New from scratch drawing and extract everything from the old file over to the new drawing.
V18, V19, V20, V21, 2015/ 16/ 17/ 18 Pro. Platinum
Deluxe V20, V21, 2015/ 16/ 17
Windows 10 Home Premium 64 bit, 32 GB
NVIDIA Geforce GTX 780m, 1 GB