Houdini is backwards compatible. Older versions of Houdini will run with the most recent license.

For example, if you have a Houdini 20.5 license, you will be able to open Houdini 20.5 and older (20.0, 19.5, 19.0 etc...).

• When installing older versions of Houdini, do not install the License Server component of the old version.
• If you do overwrite the latest sesinetd server binary, reinstall the latest Houdini version again.

If you require an old build of Houdini but cannot find it on the daily builds page, please contact support.