Keil MDK Licensing Error: Serial does not match product requested

Hi everyone,

I'm running into a licensing issue when building my project using Keil MDK Professional 5.42 with ARM Compiler 5.06 update 6 (build 750).

I've already activated my license using a valid activation code and confirmed that my µVision shows MDK-Professional. However, I keep getting the following error when I try to compile:



What I’ve already tried:

  • Restarted µVision after activation.
  • Verified that TOOLS.INI has:

    TOOL_VARIANT=mdk_pro
    FLEX_USE=0





    System Info

  • Keil MDK Version: 5.42

  • License Type: Activation Code

  • Compiler: ARM Compiler 5.06 update 6 (build 750)

  • Target MCU: ARM7TDMI (LPC2138)

  • OS: Windows 11

Appreciate any guidance or help — this is blocking my build. Thanks in advance!

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