The download size of (now known as Microsoft 365 Apps for Enterprise) core files typically ranges between 1.8 GB and 2.8 GB for a single language installation. While the initial setup file you download is often only a few megabytes, it acts as a bootstrapper that streams the core installation data from Microsoft's servers. Core File Download and Installation Sizes
The exact download size depends on the version (32-bit vs. 64-bit), the number of language packs included, and the specific distribution channel. Estimated Size ~5 MB - 15 MB Core Installation Download 1.8 GB - 2.8 GB Hard Disk Space Required (Windows) 4 GB (minimum) Hard Disk Space Required (macOS) 10 GB Key Factors Affecting File Size MS office 32 or 64-bit on Windows 10 PC download file size of office 365 proplus core files