Cam,
This is quite possible. It means copying in the JA files from your TS2010 install into the TS12 install then registering your TS2010 serial number in TS12. Once you do that, you can download the updated content from the DLS because there are lots of errors in the older stuff that needs correcting.
About the errors. The errors always existed in the content but were never reported. Instead the errors were ignored by the program and the simulation continued along as though nothing was wrong to a point. The problem with doing things this way is there is a performance hit as the simulation has to step through each and every line of each config file, skipping errors, ignoring broken scripts, etc. This extra works causes major performance issues and worse, major crashes to the desktop! As time went on, N3V started with more strict error-checking. This started in TRS2006 and has gotten more and more strict with compatibility mode in TRS2009 and TRS2010 allowing older content to work without repairs. Starting with the last SPs for TRS2010 and now TS12, there is no longer a compatibility mode. All content must be repaired to work properly.
The repairs are not difficult, just time consuming if you have a lot of content. The errors range from missing textures, typographical errors in config files, and broken scripts. Most of the issues are fixable outside of the scripting ones for me. Anything I couldn't fix, and wasn't using, got deleted. Starting earlier this year, or was it last year? I can't remember when, an initiative started to clean up the DLS. This was created to bring older content up to current standards, making the revised content error free. With over 220,000 plus items on the DLS, the process has taken time, but quite a bit of the content has been cleaned up.
John