Cause: Windows UAC blocking write permission.
Fix: Run µVision as administrator. Or reinstall MDK 4.74 to C:\Keil_v474 and grant Modify permission for Users group.
Many legacy ARM7 (e.g., NXP LPC23xx, Atmel AT91SAM7) and classic Cortex-M3 (e.g., STM32F1x, TI LM3S series) devices have been superseded. Newer MDK versions have dropped support for these chips from their default databases. MDK 4.74 includes direct support for hundreds of now-obsolete devices without needing to hunt down legacy pack files.
Post-install patches – Apply the official MDK474a.EXE and MDK474b.EXE cumulative updates.
License activation – Use your legacy license ID code (LIC). The offline licensing server for v4 is still operational as of 2025, but online activation may fail. Use the "Get LIC via Email" method.
While version 4.74 is a classic, it is not suitable for every project. Beware:
