You can install MDK v5.25 alongside newer versions (like v5.38) by choosing a unique installation folder (e.g., C:\Keil_v525 ).
: Improvements to USB Device handling, including corrected MSC class support and Ethernet RNDIS driver fixes. Legacy Support mdk-arm version 5.25 download
Many engineering firms stay on version 5.25 because of . If a medical or automotive project was certified using the 5.25 compiler toolchain, switching to a newer version might require an expensive and time-consuming re-certification process . Installation Tips You can install MDK v5