For Houdini 19.0

From here you can install the add-on manually.

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

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

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

Release 7.1.5

1. Updated for Houdini 19.0.

2. Documentation popups changes:

   Display version tag for the expressions added in the last few versions of Houdini.
   Provided by the documentation, so it is not always present.

3. New expression functions added:

   cophasplane
   fpadzero
   nvertices
   nverticesgroup
   pdginputtag
   pdgmappath
   pdgoutputtag

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

4. New commands added:

   sceneviewconfig
   viewforeground