> For the complete documentation index, see [llms.txt](https://docs.theiamarkerless.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.theiamarkerless.com/axiom-v2025/theia3d-documentation/getting-started/license-activation.md).
# License Activation
After installing Theia software, it is necessary to activate the license prior to using the software. To activate your Theia3D license, run Theia3D as an administrator by right-clicking on the icon and choosing ***Run as administrator***.
When running Theia3D as an administrator, a prompt to enter the license key will appear, as below. Enter your license key in this window and click ***Activate***. You can access your license key from the [Theia downloads portal](https://service.theiaserver.com/login) using the login information provided at the time of purchase.
License key entry dialog window.
If the PC is connected to the internet, the license will automatically activate and Theia3D will open.
If the PC is ***not*** connected to the internet, a dialog window similar to that shown below will appear, indicating that it is necessary to contact Theia support via our [support portal](https://support.theiamarkerless.com/support/home) or by emailing .
After contacting Theia Support, enter the Activation Code as provided by our team and click ***Activate***. The license activation will then be completed, and Theia3D will open.
{% hint style="warning" %}
If a manual license activation is required, please remember to include the License, System, and Token information provided in the warning dialog when contacting .
{% endhint %}
---
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