Step 1: Mount the ISO
Step 2: Run the Installer
Step 3: Silent / Custom Installation (Advanced)
For IT pros, use the Office Deployment Tool (ODT). Download setup.exe from Microsoft, then run:
setup.exe /configure configuration.xml
A sample configuration.xml for LTSC Professional Plus 2021:
<Configuration>
<Add OfficeClientEdition="64" Channel="PerpetualVL2021">
<Product ID="ProPlus2021Volume" PIDKEY="XXXXX-XXXXX-XXXXX-XXXXX-XXXXX">
<Language ID="en-us" />
</Product>
</Add>
</Configuration>
Step 4: Activation
Microsoft Office LTSC (Long-Term Servicing Channel) Professional Plus 2021 is a perpetual-license release of Microsoft Office intended for organizations and users who need a fixed-feature, long-term support version rather than the continuously updated Microsoft 365 subscription. It includes core Office apps such as Word, Excel, PowerPoint, Outlook, Publisher, Access, and Skype for Business depending on the edition and licensing.
❌ No legitimate source: "Office 2021 LTSC Professional Plus ISO" is not available on Amazon, eBay, or random file-sharing sites. Any “lifetime key” for $20 is fake or stolen.
Best for advanced users who need a specific configuration or cannot access VLSC.
Microsoft provides a free tool to download Office installations directly from their CDN. This creates an "offline installer" similar to an ISO.
Step 1: Download the Tool
Download the Office Deployment Tool from the official Microsoft website. Run the executable to extract the files (setup.exe and configuration XML files) to a folder on your desktop.
Step 2: Create the Configuration File
Delete the default XML files provided. Create a new text file named configuration.xml and paste the following code: Step 1: Mount the ISO
<Configuration>
<Add SourcePath="c:\temp\office2021" OfficeClientEdition="64" Channel="PerpetualVL2021">
<Product ID="ProPlus2021Volume">
<Language ID="en-us" />
</Product>
</Add>
</Configuration>
Note: You can change OfficeClientEdition to "32" if required and Language ID to your preferred locale.
Step 3: Download the ISO Files
Open Command Prompt as Administrator. Navigate to the folder where you extracted the ODT files.
Run the following command:
setup.exe /download configuration.xml
This will download the actual Office files to the path specified in the XML (e.g., c:\temp\office2021).
Step 4: Install
Once the download is complete, run:
setup.exe /configure configuration.xml
| Source | Safety | Legality | Works long-term? | |--------|--------|----------|------------------| | VLSC / Microsoft Admin | ✅ Safe | ✅ Legal | ✅ Yes | | Evaluation ISO + own key | ✅ Safe | ✅ Legal | ✅ Yes (with key) | | “Top download” crack sites | ❌ Malware risk | ❌ Illegal | ❌ Breaks after 180 days |
Bottom line: If you need Office LTSC Professional Plus 2021, get it through Volume Licensing or the official Evaluation Center. Never trust “top ISO download” blogs – they profit from your security risk.
Have questions about deploying Office LTSC? Drop a comment below.
Tags: office ltsc 2021, professional plus 2021 iso, office 2021 download, volume licensing, microsoft office iso
Microsoft Office LTSC Professional Plus 2021 is a specialized, "locked-in-time" version of the productivity suite designed for businesses and regulated environments that require long-term stability and offline functionality
. Unlike the standard subscription-based Microsoft 365, this version is a one-time purchase that provides a perpetual license for a single machine. Microsoft Learn Overview of Office LTSC 2021 - Microsoft Learn Step 2: Run the Installer
Understanding Microsoft Office LTSC Professional Plus 2021 Microsoft Office LTSC (Long-Term Servicing Channel) Professional Plus 2021 is a specific, "perpetual" version of the Office productivity suite designed for commercial and government customers who require a stable, non-subscription environment. Unlike Microsoft 365, which relies on a recurring subscription model, Office LTSC is a one-time purchase that provides a device-based license for long-term use.
The "Professional Plus" edition is the most comprehensive tier available in this channel. It includes the following core applications:
Word, Excel, and PowerPoint: The foundational trio for document creation, data analysis, and presentations. Outlook: For managing email and calendars. OneNote: For digital note-taking.
Access and Publisher: Specialized tools for database management and desktop publishing (available for Windows only).
Teams and Skype for Business: Communication and collaboration platforms. The "ISO Download" and Official Deployment
A common point of confusion for users is searching for a direct ISO download for this version. Unlike consumer retail versions, Microsoft does not typically provide a standard ISO file for Office LTSC 2021. Instead, the official method for acquisition and installation is through the Office Deployment Tool (ODT). Official Installation Steps
The process is more technical than a standard installer and generally follows these stages: Download Link for Office 2021 LTSC - Microsoft Q&A
To download and install Microsoft Office LTSC Professional Plus 2021, you must use the Office Deployment Tool (ODT). Unlike standard retail versions, LTSC 2021 installation files are hosted on the Office Content Delivery Network (CDN) and are typically deployed via command-line tools rather than a direct ISO download from the Volume Licensing Service Center (VLSC). Step 1: Download the Office Deployment Tool
Download: Get the latest version of the ODT from the Official Microsoft Download Center.
Extract: Run the .exe file and extract the contents (which include setup.exe and sample XML files) into a dedicated folder on your computer, such as C:\Office2021Setup. Step 2: Create a Configuration XML File Step 3: Silent / Custom Installation (Advanced) For
You need an XML file to tell the tool exactly which version of Office to download.
Use the Admin Center: The easiest way is to use the Office Customization Tool at the Microsoft 365 Apps admin center. Select 64-bit architecture.
Choose Office LTSC Professional Plus 2021 - Volume License from the product list.
Configure your preferred languages and apps to include/exclude.
Export the configuration and save it as configuration.xml in your setup folder. Step 3: Download Installation Files
This step essentially creates your "offline installer" (similar to an ISO) by pulling files from Microsoft's servers. Open Command Prompt as an Administrator.
Navigate to your folder using the cd command:cd C:\Office2021Setup
Run the download command:setup /download configuration.xmlNote: The command prompt will look like it's doing nothing while it downloads several gigabytes of data into a new "Office" subfolder. Step 4: Install Office LTSC 2021
Once the download is complete and the cursor reappears in the command prompt, run the installation command:setup /configure configuration.xml Step 5: Activation Launch an App: Open any Office app like Word or Excel.
Enter Key: Go to File > Account > Change Product Key and enter your volume license MAK key, or use a KMS host for organization-wide activation.
If you are an individual user:
Command line example for ODT:
<Configuration>
<Add OfficeClientEdition="64" Channel="PerpetualVL2021">
<Product ID="ProPlus2021Volume" PIDKEY="YOUR-VL-KEY-HERE">
<Language ID="en-us" />
</Product>
</Add>
</Configuration>