The heart of the internet If the Install button is grayed out, your Office 365 subscription might have expired. Select your subscription from the list in Renew Office 365 for business to see the steps for how to renew it. If you have a Microsoft 365 plan, to keep it active, you have to sign in at least once every 30 days. If Office is taking a long time to install you may be on a slow connection. If Office still won't install, check that your computer meets the system requirements to install Office. Upgrade or update Office issues If you're a student or teacher and don't see an option to install Office, you may be eligible for Office 365 Education, which includes Word, Excel, PowerPoint, and OneNote. All you need to get started is a valid school email address. If that didn't help, use this troubleshooter to uninstall Office completely. If you're looking for the steps to download and install the latest version of Office, see Install Office on your PC or Mac. To troubleshoot Mac activation issues, see the "Activation" tab on What to try if you can't install or activate Office for Mac. If there's a Learn More link on the error message, select that.