Can't download tune/ Incompatible Parts Issue

Hey everyone. I’ve had this problem off and on for quite awhile now and I just don’t understand it. Ive been trying out drag tunes lately, comparing them to mine and alot of them that claim better times give the “The selected tune cannot be used. It contains incompatible parts”. I just can’t get around it and/or wrap my head around the issue. Is there a way to fix this on my end or get around it? I have pretty much every part purchased for the vehicles besides all of the rims etc.

Try again 10 seconds later. Seems to work for me.