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To be honest, I was having problems with my computer and I uninstalled it. Now whenever I try to reinstall it, it will not appear in Trainz 12.
Have you tried a QDR after removing it?
I guess that DLC files are packed in .JA files so try copy these files to builtin folder and in options enter your DLC serial number....where I should I put it in the Trainz file on my computer? Userdata? Extras?
Put the serial number in the Launcher options...
Add the "CD Key" where?
Put .exe on the end of what?