# 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***.

<figure><img src="/files/cXUtTmcgs2Aw6516P3d0" alt=""><figcaption></figcaption></figure>

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.

<figure><img src="/files/EmkxVt0wnZK3VY5p8x8N" alt=""><figcaption><p>License key entry dialog window.</p></figcaption></figure>

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 <support@theiamarkerless.com>.

<figure><img src="/files/UBMknme8Nym1ltObgrUW" alt=""><figcaption></figcaption></figure>

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 <support@theiamarkerless.com>.
{% endhint %}


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