For Houdini 19.5

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 7.2.0

1. Updated for Houdini 20.0.

2. Added short descriptions of functions in the completions window.

3. New expression functions added:

   efit
   trim
   ltrim
   rtrim
   pointvals
   vertexvals
   primvals
   detailvals

   Tip: to read about new functions quickly,
   copy the list into an empty Sublime Text document,
   set the HScript syntax, and check the documentation helpcards (Ctrl+Alt+D).

4. New commands added:

   geospreadsheet
   reloadseq
   viewcharacteropts
   viewrotovideo

5. Fixed broken documentation links for functions in helpcards.