Trainz for Mac is a disaster. I have spent hundreds of hours and encountered nothing but horrendous problems. Using Content Manager, deleting assets that are missing dependencies doesn't work (after rebuilding the database), downloads die with less than 1% to go with "Unable to contact host" message, had a one month subscription for FCT and every attempt to download died with the above error or "Missing dependencies." More problems too numerous to mention, not the least of which is that I have 4 tickets going back over a month, none of which have received a response.
Sorry I wasted my money (and a good bit of it!)
I suspect you're all too busy working on TANE to pay attention to users of other versions.