Trainz12 "unknown content error"

I went on Content Manager v3.6 and try to download Ios - Complete, the 'unknown content error' appears. Can you help me fix this?
You can start the fix by...

Since you do not have a version of the game listed to your name, it can be that you have not registered your game to your account. To do so, go here:
https://www.auran.com/planetauran/SN_Enter_Serialnumber.php
Please also tell us what build number (bottom right corner of the start-up window) you are using and what the exact assets are you are trying to download, as that can help us explain the problem and/or solve it.
 
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