操作指南 3 分钟· 更新于 2026-10-16
下载 Office 2021/2019 离线安装包（无需流式安装）
Office 永久版的完整离线安装程序 — 适用于慢速网络、离线电脑和 IT 部署。
The default Office install streams from Microsoft's servers — painful on slow connections and impossible on offline machines. The full offline installer exists; Microsoft just buries it.
For account-bound licenses
- •Sign in at account.microsoft.com/services
- •Find your Office product → Install → click "Other options" / "Download an offline installer"
- •Choose language + 32/64-bit → you get a full .img/.iso (~4 GB)
- •Mount it, run setup — no download during install
For MAK / volume deployments
IT deployment uses the Office Deployment Tool (ODT) — a config XML downloads the full source once, then you can install to any number of machines from the local copy:
:: Download the source (run once, ~2-4 GB) setup.exe /download configuration.xml :: Install from the local copy on each PC setup.exe /configure configuration.xml
Edition check
The installer must match the key's edition — a Professional Plus key will not activate a Home & Business install. Verify the key's real edition with our PID Checker before downloading 4 GB of the wrong build.