You installed a clean copy of MDK 5.38 or 5.39, which never included v5.
Several technical blogs and developer communities offer pre-packaged ARMCC folders for download. While these can be convenient, they are not official ARM distributions. Always verify the integrity of the files and scan them with up-to-date antivirus software before proceeding. keil arm compiler version 5 download
| MDK Version | Arm Compiler 5 Included? | Arm Compiler 6 Included? | Recommendation | | :--- | :--- | :--- | :--- | | MDK 5.39 | No (Only AC6) | Yes (v6.19) | | | MDK 5.38 | No (Only AC6) | Yes (v6.18) | Avoid for v5 | | MDK 5.37 | No (Only AC6) | Yes (v6.16) | Avoid for v5 | | MDK 5.36 | Yes (v5.06u7) | Yes (v6.16) | Ideal | | MDK 5.35 | Yes (v5.06u7) | Yes (v6.15) | Also works | You installed a clean copy of MDK 5
Add C:\Keil_v5\ARM\ARMCC\bin\ as an exclusion in your AV software before extracting or running. This is a false positive. Always verify the integrity of the files and
A Complete Guide to Downloading and Installing Keil ARM Compiler Version 5
Using Arm Compiler 5 with newer MDK versions may introduce licensing issues.
Before proceeding with the download, it is critical to understand what “version 5” means.