# Purchasing Parallels Desktop

If you're using a trial version of Parallels Desktop, you can easily purchase the full version right from the application interface. To do so:

1. Click **Buy** in the **About Parallels Desktop** window or when you see the promo.
2. Choose one of the following:
   * **Upgrade:** Select this option to upgrade your current version of Parallels Desktop. Please keep in mind that you will need the activation key for your previous version. If the **Upgrade** option is selected by default, Parallels Desktop has already automatically detected the key for the previous version. If not, please make sure you have it.
   * **Buy Full Version:** Select this option to purchase Parallels Desktop if you have never used it before.
3. Follow the onscreen instructions. You may need to scroll down to see all the information.


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
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```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.