You can install it using sublime Package manager as Fall syntax Colorscheme
Ctrl + Shift + P and type "Package Control: Install Package", then type again "Fall syntax Colorscheme"
Or you can install it manually
After download just go to Preferences > Browse packages and create a directory with the file fall-syntax.tmTheme
If you don't know how to activate it either, just press Ctrl + Shift + P and type "Select color scheme", then choose the Fall syntax color scheme
Changes
v1.0.0 > v1.1.0
Fix for punctuation scope
Fix for punctuation color
Minor fixes for acurracy (invisibles, guide colors)
v1.1.0 > v1.1.1
Fixed ocapacity for select and guide
v1.1.1 > v1.1.2
Fixed color bug in some comment characters