Houdini Apprentice License Not Activating or Expired

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Ongoing Windows, macOS, Linux Updated November 14, 2026How we research

Quick answer

Apprentice licenses must be re-activated every 30 days. Activate through the License Administrator, or use the Activate Apprentice button with the on-premise server.

Most likely fix: Activate via the License Administrator

How to fix it

Try these in order — the most common fix is first.

  1. 1. Activate via the License Administrator

    1. Open the Houdini Installer and choose License Administrator at the bottom
    2. Open the top-right drop-down (SideFX login is optional)
    3. Follow the prompt to install Apprentice licenses
    Did this fix it?
  2. 2. Use the on-premise server without login

    1. In the top-right drop-down choose 'Switch to on-premise license server (sesinetd)'
    2. In General on the left click Activate Apprentice
    Did this fix it?

Symptoms

Apprentice license missing or expired, Houdini won't run in Apprentice mode.

Why it happens

  • Apprentice licenses expire and need re-activation every 30 days
  • Not activated after install

This guide also covers

  • houdini apprentice license expired
  • houdini apprentice activate
  • houdini apprentice 30 days

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