跟着江协下载的，但是一直报错，该怎么解决啊
Hello
You will need MDK PROFESSIONAL EDITION, from which you can generate an appropriate license to enable old tools such as Arm Compiler 5.
See https://developer.arm.com/documentation/ka006350
A better link:
https://developer.arm.com/documentation/102516/1-4/User-based-licensing-overview/Backwards-compatibility