The preferred method is to use the Sublime Package Manager. Alternatively, the files can be obtained on github:
https://github.com/nucleic/sublimetext-enaml-syntax
The home page of the Enaml project can be found at https://github.com/nucleic/enaml
This software is published under teh same licence as the Enaml project (BSD 3-clause) which can be found at https://github.com/nucleic/enaml/blob/master/LICENSE