The Office Deployment Tool (ODT) . This official Microsoft tool lets you download the full installation files (ISO or local source) once and reuse them indefinitely.
The XML file tells ODT which Office apps (Word, Excel, PowerPoint, etc.), which architecture (32/64-bit), and which language to download. download office 365 offline installer
Download Office 365 Offline Installer: Work Seamlessly without Internet The Office Deployment Tool (ODT)