1) Download the Back to Basics 2010 package:
2) Now, choose the level you want to play from the list in the downloads section.
3) Copy the tr4 file into the data/ folder and copy the script.dat and english.dat files into the main trle folder.
4) Create a setup link for the tomb4.exe and make sure that Volumetric FX are enabled.
Please take note that Back to Basics 2010 is not playable on a Mac.