It is available for download here
http://webrailroader.com/ctc/download-page/This is a maintenance release with some error corrections.
The ZIP file now includes the ctc.exe itself. You may copy that in your favorite folder instead of running the setup.exe. If there is a problem with the ctc.exe you may run the setup.exe one time. If you get an upgrade, you just can override the ctc.exe installed via setup.exe
As always upgrades to previously purchased products are free.