To can play in level The Cave, one should copy file 'city.tr4' being in brochure DATA, added to packet 'Tomb Raider Anniversary Demo: The Cave' and to insert to catalogue DATA in packet Tomb Raider Level Editor. 
To copy files SCRIPT.DAT and ENGLISH.DAT and to insert to main catalogue of Tomb Raider Level Editor. 
Then copy files being in AUDIO catalogue, which be added to catalogue 'Tomb Raider Anniversary Demo: The Cave' and to insert it to AUDIO catalogue in main folder Tomb Raider Level Editor.
Next for decoration level one should copy file load.bmp to main catalogue Tomb Raider Level Editor.
Starting game.

At the beginning of game when the flyby begins,  press the key of looking. If not, the film will in infinity. I apologize for problem.

I'm sorry for small mistakes in game.  

I wish you nice play!!!

Razyel