Arm does not publicly list every historical version on its main download page. Instead, they are archived. Here are the legitimate sources:
As of 2025, this is typically found at the bottom of the page or under a dedicated "Archive" link: https://www.keil.com/update/sw/ mdk-arm version 5.25 download
If you're an existing user, you can easily upgrade to MDK-ARM version 5.25. If you're new to MDK-ARM, now is a great time to try it out and experience the benefits of this powerful development environment. Arm does not publicly list every historical version
Once you have the legitimate MDK525.EXE , follow these steps for a clean installation. If you're new to MDK-ARM, now is a
: Symbols and functions became underlined links, allowing developers to press F1 and jump directly to the relevant documentation—a small change that saved hours of manual searching. How to Access Legacy Versions