Error: NI License Manager Was Unable to Install the License File

Updated Sep 26, 2022

Reported In


  • NI License Manager 4.0
  • Volume License Manager

Issue Details

I am trying to install a disconnected license file in NI License Manager 4.0 or later. When I try to install it, I get the the following error message:

NI License Manager was unable to install the license file.


  1. Verify that you are using a disconnected license using Getting Started with NI VLM - Creating a Disconnected or Home License  (make sure you Apply Changes before you generate the license file).
  2. If you are using a disconnected license file, rename the license file.
  3. Reinstall the license file using NI License Manager.
Additionally, if your software admin's PC has any sort of always-on encryption like Sophos, turn it off while creating a disconnected license.

Note: If you are using a license file for the Volume License Server. You will need to install the license file in NI Volume License Manager

If this still does not address the issue, it may be that you are logged in as the incorrect user for a named disconnected license (for example, the administrator username is logged in instead of the end user tied to the license file). Ensure that you are logged into the machine under the correct username in order to license the products and activate the software. 

Additional Information

This error can when you try to install a license file with the same name as a previously-installed license file. It is a known issue with NI License Manager 4.0 and a Corrective Action Request has already been submitted.

It is important to recognize the difference between NI License Manager and NI Volume License Manager. Use the article What Is NI Volume License Manager?  to learn more. Verify that you are using the correct software for your license file. 

Please note : If you require the location of the license files in Windows, please see the following : Local NI Software License Files Location in Windows