For silent installs run the installer with /? for documentation:

houdini-18.5.xxx-win64.exe /?

The /Registry option ("Yes" or "No", default "Yes") controls whether or not the installer will create Registry keys when installing Houdini. This mostly impacts whether or not the version of Houdini will show up in the Add/Remove Programs list.

It is recommended to use the defaults unless you have specific needs, such as installing Houdini on a shared network path. You cannot cannot define the "License Server Path" with the /Registry option.

To set the License Server

• The easiest method is to configure a DNS SRV record.
  
• Client machines should automatically find the Houdini license server.

Linux or Mac OSX:

• hserver -S server-name
• A hidden file in users's home directory called .sesi_licenses.pref
• This hidden file will contain one line: serverhost=license-servername

Windows:

The best solution is to modify the registry:

reg add "hklm\software\Side Effects Software\Houdini" /v LicenseServer /t reg_sz /d server-name /f

To uninstall:

Run the uninstall.exe located in Program Files -> Side Effects Software -> Houdini 18.0.xxx.

Type /? for options

Type /S for silent.