I do have CSP : version is 0.1.60 (the recommended one)
Your help is very much appreciated and worth gold! I've asked about 20 sim racers and track builders and only 2 people have reported the issue up til now, you included. The only similarities I've found is the CSP version, thanks to you
Can you try updating CSP to the newest version (1.75 or the 1.76 preview if you're on Ilja's patreon, worth the 1€) and see if it's working? That's the only difference I've found between those who can and who can't run the track.
Also just a general note:
I'd always update to the newest CSP version you can get and disregard the "untested" flag. Even the preview versions on patreon are really stable. The updates though, oh boy are you missing out on a looot of new features. It's like comparing a simracer from 2015 with a game from 2021. It's like playing a new game and that's not even an exaggeration ^^