To download Tomb Engine simply visit the link below:

GitHub Repository

Scroll down to the bottom and choose the correct option (see table below).

Happy Building.
 
TombEditor****_x64.exe Contains the 64-bit build of the Tomb Editor suite and the latest version of TEN. This is the most common version in use for modern computers.
TombEditor****_x86.exe Contains the 32-bit build of the Tomb Editor suite and the latest version of TEN. Only install this version if you are suffering performance issues with the 64 bit version.
TombEngine****_Update.zip Quick hotfix version for those who’ve already downloaded one of the above.