I am new to MSTS, but an old hand at computers. Thus when I started downloading new engines for the game, I had no problem with figuring out where they went, adding consists, all of that. But what is stumping me is the number of repaints of the F7, whose installation insructions all begin with "Download and install the 3D Trains Demo F7 (3DT_F7A_DEMO)....". Needless to say, the file no longer exists as you have upgraded your demonstration engines! A search of the web has not located any archive libraries with the original file, so my request is if whether in your sympathy for us you would consider a release of the original file?
By the way, I do completely enjoy the new ones, especially the caboose add-ons, as I am an old-timer Model Railroader, and do not consider a train complete without the crummy on the rear end!