It all started after I shared the Keil µVision installation manual with the students on 9 October 2025. Everything seemed fine at first, until our class session on 15 October 2025. When several students reported encountering the “missing compiler 5” error during program build.
At that time, I reviewed their installation steps one by one, but the issue persisted. It wasn’t immediately clear whether the error came from a missing ARM toolchain component, a corrupted setup, or path configuration in Keil µVision.
By 29 October 2025, after our follow-up class, I noticed the problem still hadn’t been fully resolved. Between teaching, project supervision, and updating other course materials, I decided to dedicate some time to recheck the installation sequence myself in the morning 30 October 2025.
After about 40 minutes of testing, troubleshooting, and re-verifying the installation paths, I finally found the root cause; and the correct fix for the missing compiler 5 error. During that time, I also updated the installation manual with the corrected steps.
However, I haven’t shared the updated manual in the class Telegram group yet. Only a partial explanation and end result. were posted there. To help students who needed a quick reference what they should achieve in the end while I continue refining the full document for clarity and completeness.
Until then, have fun in trouble shooting error in Keil µVision.
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