Downloading source code from SVN
TE is in very early development stage and the source code changes frequently. Thus, the preferred way of getting it is to download it directly from the SVN server.
The address is svn.transportempire.com
Note: Apart of TE source, the repository also contains deprecated code and a lot of binaries (more than 100MB) - so don't download everything :-)
The [download directory] contains packed builds of the program. Note that these may not be fully up-to-date. To get the current version of TE, you need to download the source from SVN and compile it yourself.