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LICENSE: Web Error Code 1773 When Installing a License

Information in this knowledgebase article applies to:

  • C51 
  • C166 
  • C251
  • Keil MDK


When following these steps for license registration, the Keil webpage gives the following error message:

Problems were detected with the information submitted. Please correct these issues and re-submit the form.

  • This product has been installed and registered on too many different computers. Please contact Technical Support and report code 1773 for assistance with your installation. They will work quickly to help you obtain the correct license code for your product.

What causes this error, and how can I correct it?


With your Single-User Product Serial Number (PSN) the License Agreement allows using a Keil product by exactly one person on a maximum of two computers.

A licensing process generates error 1773 when:

  • You attempt to license more than two computers using a Single-User PSN.
    Solution: Uninstall the LIC from one of the licensed computers, and then request a new LIC.


  • If you are not aware of what computers currently are registered under your PSN, contact Keil Support to report the error code 1773 and your serial number (PSN or LIC).
  • Upon receiving your Support-Ticket, Keil Support will inform you of your current PSN registrations.
  • If there are different users registered to a PSN, this is considered to be a License Violation, which has to get fixed immediately:
    1. Determine who is the sole user of the product.
    2. The other user must uninstall the LIC.
    3. Confirm the result to Keil Support.


Last Reviewed: Wednesday, October 21, 2020

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