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Marlowe9a,
Welcome to Trainz and to the forums.
What exactly are you trying to do?
To download and install assets, you need to use Content Manager (CM). Content Manager also needs a login to the servers. Ensure that your Windows firewall or antivirus program is not blocking Content Manager from connecting, otherwise, you will not be able to download.
You said that you have TRS2006.
Are you using the same login name that you used previously?
If you are not, you need to contact the helpdesk using the form above (button) to get the accounts merged. This will assist you with many things.
You can easily merge in content from previous versions. If you already have TRS2006 installed, you can import the content from TRS2006 into TS12 using the import content feature in Content Manager. This process can take a very long time, and there maybe content errors which will need to be repaired in order to use the content in TS12.
John