Hello folks, we had to retire the Donner Pass for the reasons I stated above (we would have to incorporate TrainZItalia as a regular e-commerce company, and all our accountants shrieked "Don't even think about it!"). Since then, the TS12 version can be purchased directly from Jango.
Some daring souls attempted importing it in TRS19, with mixed success.
As a minimum, the route requires the replacement of many vegetation assets, as it used pofig's trees, which do not work in T:ANE and subsequent versions. There are also some issues about a bunch of assets that behave pretty strangely in TRS19.
I have no news about the route and yes, I also would like to have it back, as I made a lot of sessions for the TS12 version and I would love running them in TRS19. I will ask Jango the next time I hear him.
P.S. The Rollins Pass is on the launch pad: I hoped to launch it for Easter but we had some last-minute technical glitches to solve.