Once registered, you can toggle between compiler versions per project:
Functional safety projects (such as ISO 26262 or IEC 61508) that were certified using Keil Compiler v5 must continue using it to preserve their safety certification status. Prerequisites Before Downloading
You generally need an existing installation of Keil MDK-ARM (Microcontroller Development Kit).
Click the button next to "Use ARM Compiler". Click Add path to compiler . keil arm compiler version 5 download
Proceed through the remaining standard installer steps by clicking "Next," accepting the license agreement, and waiting for the installation to finish.
To ensure software integrity and security, always obtain the compiler directly from official ARM repository channels. Step 1: Access the Official ARM Product Download Portal
After the compiler is installed, you must manually add it to your Keil µVision environment before it can be used in your projects. Once registered, you can toggle between compiler versions
Downloading standalone compiler toolchains directly from Arm requires a registered user account on the official Arm Silverback/Support portal. How to Download Keil ARM Compiler Version 5
The challenge began with Keil MDK version 5.37. Starting with this release, Arm no longer included Arm Compiler 5 in the default MDK installation, leaving only Arm Compiler 6 and GCC. This change forces developers who need to maintain older projects to manually acquire and integrate AC5.
If you downloaded a standalone installer, run it and target a specific directory, such as: C:\Keil_v5\ARM\ARMCC_506u7\ 2. Register the Toolchain in uVision Launch . Click Add path to compiler
If you have an expired or active Keil Gold/Platinum support account:
Inside the extracted folder, navigate to the installer directory and run the setup.exe file to begin the installation wizard.
This gives you the compiler only (no uVision IDE).
By maintaining a dedicated installation of Keil ARM Compiler Version 5, you preserve your ability to support, maintain, and certify legacy products without destabilizing production-proven firmware codebases.