You can install multiple versions of MDK on the same machine, but ensure they are installed in separate directories (e.g., C:\Keil_v525 and C:\Keil_v538 ).
Windows driver signing changes after 2018. Fix: Boot Windows into Disable Driver Signature Enforcement mode, then reinstall ULINK drivers from C:\Keil_v5\ARM\ULINK\ . mdk-arm version 5.25 download
: Look for the "MDK-ARM" category and select version 5.25 from the list of available maintenance releases. Complete the Form MDK-ARM Version 5
Note: If you don’t have one, you can find your serial number in the license file of your tools or via the menu in an existing installation. Security and integrity checks (actionable)
: This version introduced significant performance improvements and support for the latest C/C++ standards. Software Packs
The default is C:\Keil_v5 . Changing the path is possible, but avoid spaces or Unicode characters in the path. For example: D:\Dev\Keil_v525 .