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USB-eLicenser is not being recognized on OS X 10.11

This article refers to eLicenser-based license management.
If your software uses Steinberg Licensing introduced in January 2022,
the following information is not relevant for you.

Problem

On a computer running OS X El Capitan (10.11), a USB-eLicenser is not being recognized by the eLicenser Control Center. Licensed applications cannot be started. The following error messages may appear: 

  

Solution

The problem might be related to Duet, an app allowing you to use an iPad as a second monitor. It should not occur when the latest software versions are installed. 

Therefore, please update Duet, the eLicenser Control Center as well as OS X El Capitan.  

If the issue persists, we can only advise to quit Duet before running your eLicencer-based software.

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