For Houdini 18.5

From here you can install the add-on manually.

Drop VEX.sublime-package file into Data/Installed Packages

Example:
C:\Users\teared\AppData\Roaming\Sublime Text 3\Installed Packages\VEX.sublime-package

Then follow the rest of the readme, including optional setup sections.

Release 7.1.3

1. Updated for Houdini 18.5.

2. Add dictionary type:

   https://www.sidefx.com/docs/houdini/vex/dicts

3. New VEX functions added:

   chdict
   curvearclen
   filter_remap
   importance_remap
   invlerp
   isshadingRHS
   json_dumps
   json_loads
   keys
   ndcdepth
   ocio_parsecolorspace
   pointlocaltransforms
   pointtransform
   pointtransformrigid
   pointtransforms
   pointtransformsrigid
   ramp_lookup
   ramp_unpack
   random_brj
   setpointlocaltransforms
   setpointtransform
   setpointtransforms
   solvephysfbik
   spline_cdf
   svddecomp

   Tip: to read about new functions quickly, copy the list in empty
   Sublime Text document, set VEX syntax and check documentation helpcards.