If you experience unexpected behaviour or crashes, please contact support@perclass.com


Please provide:

  • Detail on your license (dongle number or activation key)
    • Dongle: 
      • USB dongle is enabled using license file stored in C:\Users\USERNAME\AppData\Roaming\perClassBV directory. The license file filename contains dongle number Dxxxx
    • Activation key:
      • Activation key is listed in the mira.ini file in C:\Users\USERNAME\AppData\Roaming\perClassBV
  • Specific version of perClass Mira you're using
    • Please make sure you're running the latest available version of the software
    • You can check availability of software updates using Help / Check for updates command


  • Description of behaviour leading to a crash. This helps us to repeat and fix the problem.
  • If the behaviour leading to an issue cannot be repeated, please enable logging, use the software until the crash occurs and send us the mira.log file to support@perclass.com