The HtoA installer supports silent installs and silent extractions (an install will update houdini.env, an extract does not).
htoa-6.0.0.0_r6c54f59_houdini-18.5.696_windows.exe -h
htoa-6.0.0.0_r6c54f59_houdini-18.5.696_windows.exe [options]
Options:
-?, -h, --help Displays help on commandline options.
--help-all Displays help including Qt specific options.
-v, --verbose Verbose mode. Prints out more information.
--extract Extract installation contents in the current directory.
--extract-to <dir> Extract installation contents in <dir>.
--accept-license Do not prompt for license acceptance in silent mode.
IMPORTANT: By using this option, you accept the end-user
license agreement
--silent Silent installation (no GUI).
For example, this command silently installs HtoA on Windows. The –verbose gives you a log in the command prompt window.
htoa-6.0.0.0_r6c54f59_houdini-18.5.696.py3_windows.exe --accept-license --silent --verbose