Build 46957 is the base version (V3.4). To improve stability and compatibility with newer assets, you should patch it to the latest supported builds: Trainz Service Packs - Auran
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: A serial number can only be registered once to a single account. If you purchase a second-hand physical copy, the key is likely already "burned" or registered, making it unusable for online features like the Download Station (DLS) . How to Acquire a Legitimate Key Build 46957 is the base version (V3