Sign in with your Microsoft account: Sign in with your Microsoft account or create a new one if you don't have one.
Select your language and architecture: Select your preferred language and architecture (32-bit or 64-bit).
Download the installer: Click on the "Download" button to download the installer.
Run the installer: Run the installer and follow the prompts to install Microsoft Office 2021 LTSC Professional Plus.
Microsoft Volume Licensing Service Center (VLSC) – For business admins.
Microsoft 365 Admin Center – If you have an enterprise agreement.
Authorized OEM/Reseller portals – Such as CDW, SHI, or SoftwareKeep (with proof of purchase).
Run the Deployment: Open Command Prompt as Administrator and navigate to your ODT folder. Run the following command to download the files:setup /download configuration.xml. microsoft office 2021 ltsc professional plus 16 link
Microsoft shifted enterprise servicing options away from the older perpetual releases toward subscription-based Microsoft 365; however some organizations (regulated industries, air-gapped systems, kiosks) require fixed-function, long-term-support products. To meet that need, Microsoft provides LTSC editions of Office (and Windows) that receive security updates but not the regular feature cadence of Microsoft 365.
Office 2021 LTSC Professional Plus is the perpetual-license product targeted at volume-licensed customers needing the full Professional Plus feature set with long-term servicing support. Internally Office 2021 continues the Office 16.x major version numbering (hence “16”), tracing back to Office 2016/2019 codebase lineage and compatibility expectations.