Well, I'm sorry matey, but, I've put them all into my UP SD45 in a matter of seconds using the exe.applicator, and have just gone into my UP SD45 in the DTM Folder and they are all there and every file has been transferred across in the bogies, cabview, simulation and engine folders, the Geopcdx is this one SD45_UP.GeoPcDx and I haven't done this manually, I would refuse to do that personally, for 13 locos.
You have extracted all of the files from the 7zip first, I assume?, the SD45 Bakers Dozen Reskin Pack.rwp is a scenario, can't remember the route it's for now, I just ignored it as I wasn't interested in that too much, I then just clicked on the SD45 Bakers Dozen Setup applicator, the installer will open and should display the path of your TrainSimulator 2015 folder, if not then click on the '....' button and navigate to your TrainSimulator 2015 Railworks folder manually, you'll see the black pop up box for your Windows/System32 and watch it transfer all the files across in about 30 seconds, then I checked to ensure that they had all gone in correctly, went into a route editor, ticked the DTM UP SD45 box and they were all there. I've then placed on my Soldier Summit route Rio Grande #5315 and #5329, and drove off into the night, job done. I have a feeling that the Gentleman thinks that he can input the 7z pack directly into his game using the Package Manager, which, nobody can, the files have to be extracted first, and the only .rwp file is for the scenario, not, the engines, you have to use the applicator to get all the locomotives into your game as there are literally dozens of files to input.
Cheerz. ex-railwayman.
i7 10700k 3.8GHz Eight Core CPU, Gigabyte Z590 AORUS ELITE AX, 32GB RAM, nVidia RTX3060ti 8GB, WIN10 PRO 64-bit. 10TB HDDs in total.