From the Overview page, select Office apps and on that page, find the Microsoft 365 product you want to install and select Install. To install Microsoft 365 in a different language, or to install the 64-bit version, use the dropdown to find more options. Choose the language and bit version you want, and then select Install.

重新激活 Office 需要不同的步骤，具体取决于你的情况。 注意: 如果你已拥有 Microsoft 365 或 Office 许可证，则可以登录到 Microsoft帐户“服务 & 订阅”页，并安装你拥有的产品 () 。 或者，如果要在现有或新的计算机上安装或重新安装 Microsoft 365 或 Office，请转到： 对于 Microsoft 365 和 Office 2021 - 在电脑或 Mac 上下载并安装Microsoft 365 或 Office 2021。 对于 Office 2019、2016 或 2013 - 下载并安装或重新安装 Office 2019、Office 2016 或 Office 2013。

首次打开应用（如 Word）时，Microsoft 365 可能会自动激活。 如果它未激活且你看到 Microsoft Office 激活向导，请按照提示激活 Microsoft 365。 如果需要帮助激活，请参阅 按照激活向导激活 Office 。

See Update to enable TLS 1.1 and TLS 1.2 as default secure protocols in WinHTTP in Windows. Learn how to activate Office that is pre-installed on new Windows 10 PCs or using a new product key.

Learn how to find a Windows product key for activation, and when you'll use a digital license instead.

Learn how to redeem a gift card, code, or Office product key and spend your balance at Microsoft Store online, on Windows, or Xbox.

Learn how to activate Windows using a product key or digital license, check your activation status, and link your Microsoft account.

We'll show you self-help options first. Additional help is available if you need it, including live chat with a Microsoft specialist. Contact Microsoft Support. Find solutions to common problems, or get help from a support agent.

You can manage all of your Microsoft subscriptions in your Microsoft account dashboard. Select each subscription to change when and how you pay, or to see order history & receipts. Choose your account type.

Chat or receive a call back from a technical support expert: If you have a Microsoft 365 Basic, Microsoft 365 Personal, or Microsoft 365 Family subscription, get questions answered from anywhere via chat or request to receive a call back from one of our technical support experts.