Keil MDK is a paid commercial product. While there is a free version for some ARM-based devices (like STM32 F0/G0/L0), the full Compiler Version 5 usually requires a valid License Code (LIC). You will need to generate a CID (Computer ID) from the menu to activate it.

Look for the section and find Arm Compiler 5.06 update 7 (build 960) . Select the Win32 package for Windows and download it . Install to the Keil Directory :

A: Yes, µVision 5.29 + AC5 runs on Windows 11 build 22H2 and newer (tested).

If you are working on legacy ARM projects or using specific microcontrollers that haven't yet migrated to the newer ARM Clang (Version 6) engine, you likely need the .

Once you have the installer, follow this process to avoid common pitfalls.

The compiler is bundled with older versions of MDK (formerly uVision).

You cannot download ARM Compiler 5 as a standalone freeware tool. It requires a valid license for Keil MDK. There are three licensing tiers: