If you need to download, install, or reinstall Microsoft Office 2021, Office 2019, or Office 2016, the process is simple when using official Microsoft tools. Whether you purchased Office as a one-time license or through a digital download, you can reinstall it anytime by signing in to your Microsoft account. Below you’ll find the most common questions and official answers on how to install, activate, and troubleshoot Microsoft Office for Windows and macOS.
Where can I download Office 2021, Office 2019, or Office 2016?
You can download all versions of Office directly from Microsoft’s official setup page: https://www.office.com/setup
. Sign in with the Microsoft account you used for the purchase, enter your product key, and follow the prompts.
How do I install Office after downloading it?
Once downloaded, open the installer file (Setup.exe on Windows or .pkg on Mac) and follow the on-screen instructions. After installation, launch any Office app and sign in with your Microsoft account to activate it.
Can I reinstall Office on a new computer?
Yes. Sign in to https://account.microsoft.com/services
, select your Office product, and choose Install. You can deactivate Office on the old device if your license limit has been reached.
Do I need a product key to install Office?
If you bought a physical copy or retail license, enter the 25-character product key at https://www.office.com/setup
. If you purchased Office digitally, your product key is automatically linked to your Microsoft account.
How do I activate Office 2021 or 2019 after installation?
Open any Office app, sign in with your Microsoft account, and activation will happen automatically. If prompted, enter your product key manually.
Can I install Office on both Windows and Mac?
Yes, if your license supports multiple devices or platforms. Most Office Home & Business or Office 365 subscriptions allow installation on both systems.
What should I do if Office won’t install or activate?
Visit Microsoft’s official support page for troubleshooting installation issues: https://support.microsoft.com/office/troubleshoot-installation-errors-7e4b8b3c-9e6b-4b00-b6a8-901f1c81a7c8
.
How can I uninstall or repair Office?
On Windows, go to Control Panel → Programs → Uninstall a program → Microsoft Office → Change → Repair. On Mac, move Office apps to Trash and reinstall via your Microsoft account.
Can I install Office without the internet?
You can use the offline installer from Microsoft by selecting “Other options” on the install page and choosing Download offline installer. This is helpful for slow or limited internet connections.
Is Office 2021 a one-time purchase?
Yes. Office 2021 and 2019 are perpetual licenses, meaning you pay once and own them forever. However, they don’t include cloud features or updates available in Microsoft 365 subscriptions.