Seems to me this thread went off topic, but since we are here...
http://online.ts2009.com/mediaWiki/index.php/"trainz-build"_number
See how version 3.8 and 4.4 are in red, like they have been orphaned. Some assets that worked with previous version can jump over the 'Red' version numbers, but will not work with the 'Red' versions. The table on the page provided by the link is very useful for helping us figure out that some assets will work with what, or can jump over version numbers. I have found that TS12 assets can be uploaded with all versions of TANE and TRS19 but will not work with TMR17 (which is in 'Red'). I only say this because every route I created in TR12 works in both TANE and TRS19, but have problems in TMR17 with just one or two assets that wont or cant be found or uploaded.