Run the installer on your target PC without internet (or with a slow connection). It will install fully.
Go to the official Microsoft 365 portal (portal.office.com) → Sign in with your licensed account. office 365 install offline
Tired of slow, online-only installers that fail halfway through? You can download the full offline installer for Microsoft 365 (formerly Office 365) and use it on multiple PCs without re-downloading every time. Run the installer on your target PC without