> 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/pdfm-ug/v27-zh-cn/parallels-desktop-for-mac-27-yong-hu-zhi-nan/an-zhuang-huo-sheng-ji-parallels-desktop/sheng-ji-parallels-desktop.md).

# 升级 Parallels Desktop

如果您已经安装了较早版本的 Parallels Desktop，请按照以下步骤升级到 Parallels Desktop 27。

1. 如果您尚未购买，请购买并下载“Parallels Desktop 27 for Mac 升级版”，该产品可在 Parallels 在线商店 [https://www.parallels.cn](https://www.parallels.cn/) 购买。

   产品激活密钥会发送至您提供的电子邮件地址。
2. 如果 Parallels Desktop 已打开，请先退出 Parallels Desktop。
3. 按照屏幕上的说明示安装 Parallels Desktop 26。查看**安装 Parallels Desktop**。

   安装过程中，较早版本的 Parallels Desktop 会自动从电脑中移除。
4. 打开 Parallels Desktop，然后输入升级版产品激活密钥。

   如果您使用的是试用版 Parallels Desktop，或者您购买了旧版本但尚未在电脑中安装，系统也会提示您输入这个版本的完整密钥或升级密钥。

### **故障排除**

如果您在升级 Parallels Desktop 时遇到任何问题，您可以在 <https://www.parallels.cn/products/desktop/support/> 中找到故障排除信息。


---

# 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 by asking a question.

Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:

```
GET https://docs.parallels.com/landing/pdfm-ug/v27-zh-cn/parallels-desktop-for-mac-27-yong-hu-zhi-nan/an-zhuang-huo-sheng-ji-parallels-desktop/sheng-ji-parallels-desktop.md?ask=<question>&goal=<user_goal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.

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.