LICENSE: Web Error Code 9939 or Licensing Error Codes L9555E, R203(8)

Information in this knowledgebase article applies to:

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.

A problem was encountered with your Serial Number. Please contact Technical Support and report code 9939 for assistance with your installation. They will work quickly to help you obtain the proper license code for your product.

Or, another symptom: when compiling, the Build Output window may list one of these errors:

LICENSE ERROR (R203(8): EVALUATION PERIOD EXPIRED)

Error L9555E: License checkout for feature
  LIC0=3A...-.....-..... with version 5.0201601 has been denied by
  Keil back-end. Error code: 1

(Alternative licensing error codes could be A9555E, C9555E, or Q9555E)

This error comes up if during the registration, you enter a Product Serial Number (PSN) that already has expired.

For Silicon Labs users:

The Master PSN for Silicon Labs changed. Contact Silicon Labs and make sure you have the latest Master PSN. Other workarounds for a 9939 issue:

For STM32L0- or STM32F0 edition users: If you fail to activate MDK for an STM32L0- or STM32F0-installation, click HERE for a Product Serial Number (PSN) that has not expired.
For Cypress PSOC users: See this article for details.
For other users: If this Product Serial Number was provided by a third party, look them up here:
GENERAL: Device Support: Silicon Vendor contact
…and request from them an updated version of the PSN that has not expired. If the problem does not get solved this way, please open a Support Ticket
If a license was already uninstalled on this PC, see:
LICENSE: C9555E and R208 Error After Uninstalling LIC

Refer to Distributors
Refer to Licensing Errors in the Licensing User's Guide.
Refer to List of the licensing error and warning messages in the Errors and Warnings Reference Guide.