The Office Customization Tool that you previously used for Windows Installer (MSI) is no longer used. To configure and perform installations, you use the Office Deployment Tool, which is a free download from the Microsoft Download Center.For more information, review the system requirements. Office 2019 is supported on Windows 10 but isn’t supported on Windows 7 or Windows 8.1.In addition to Click-to-Run, the following are some other changes that you need to be aware of:

Click-to-Run has been the installation technology for most Office products since the release of Office 2013. The biggest change since Office 2016 is that the installation technology used by the new volume licensed versions of Office is Click-to-Run, instead of Windows Installer (MSI). For more information, see Deployment guide for Office for Mac. Office 2019 for Mac is also available for volume licensed customers. But, how you activate these Office products – for example, by using Key Management Service (KMS) – remains the same. These Office products now use Click-to-Run, instead of Windows Installer (MSI), as the installation technology. This includes the following Office products: Volume licensed versions of Office 2019 are available for enterprise admins to download and deploy to the users in their organization. You already have all the features, and many more, that are included in Office 2019.

For example, if you’ve deployed Microsoft 365 Apps for enterprise (previously named Office 365 ProPlus) to the users in your organization, you don’t need Office 2019. Office 2019 is separate from Office that’s available through Office 365 (or Microsoft 365) plans.

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