The simplest way to do this is to copy your existing C:\Run8Studios folder to the same location on your new machine. This way, you don't need to re-run all of your installers and your sim will be exactly the way you left it. We also strongly suggest you make a copy of this folder and keep it on a USB or other external drive as a backup in case of a computer problem.

If for some reason you cannot copy this folder (perhaps your hard-drive crashed or whatnot), then you will need to run all of your installers, starting with V3's Main Installer.

Either way, on the new computer, you may need to install the Redistributable Packs, found in C:\Run8Studios\Run8 Train Simulator V3\Redistributables