Using a local setup package offers several distinct advantages for system administrators and individual users alike:

Warning: Do not download "pre-activated" or "cracked" versions. These are illegal and often contain trojans.

When Microsoft ends support for Office 2019 in 2025, they will eventually remove the download links. If you have the offline installer saved on an external HDD or NAS, you can reinstall the software a decade from now (provided you have your product key).

An offline installer (often an .iso file or a local folder) contains the installation payload. Here is why it dominates: