I own TSW 3 on disk and none of the 3 add ons have carried over to TSW 4 and I haven’t found a solution anywhere
It’s quite easy to find the info. On the very first thread on the troubleshooting section of the forum is a getting started guide menu that takes you to a getting started web page and on that page is the following text… Train Sim World Console Games on Disc If you own a Train Sim World game on a PlayStation or Xbox disc you will need to contact Dovetail Support to use the add-ons included on the disc with Train Sim World 4. However, you only need to do this if you have not claimed the digital version of these add-ons before.