Trial Demo - Download here
You can trial the very latest BTB Evo version for a period of 14 days after which time you would need to purchase a license
This version contains all the same features as found in the purchased version. You can build your own tracks, load GPS data, export to GTR2, GT Legends, Race 07 or GTR Evolution, load your own textures and create your own materials.
The only things missing are the large material/texture packs that expand the number of surface textures available for initial use.