> For the complete documentation index, see [llms.txt](https://docs.parallels.com/landing/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.parallels.com/landing/pd-ag/parallels-desktop-licensing-guide/signing-up-and-registering-a-subscription/subscription-length.md). # Subscription Length When you purchase your Parallels Desktop Business Edition license key online, your subscription becomes effective immediately. When you purchase a Business Edition or Enterprise Edition key via our sales channels, the subscription becomes active when you [register the key in your business account](/landing/pd-ag/parallels-desktop-licensing-guide/signing-up-and-registering-a-subscription/creating-a-parallels-account-and-registering-a-subscription/registering-a-subscription.md). When you activate Parallels Desktop on a Mac computer using one of the supported activation methods, it will remain active for the duration of the subscription. You should renew your subscription before the expiration date to avoid any unintended service interruption. If you miss the expiration date and don't renew your subscription, Parallels Desktop will stop working on your users' computers. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## 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, and the optional `goal` query parameter: ``` GET https://docs.parallels.com/landing/pd-ag/parallels-desktop-licensing-guide/signing-up-and-registering-a-subscription/subscription-length.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. 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.