Q1: After compiling the Nuvoton BSP, the build output "compiler 5 does not support the selected User Based Licensing technology."

Answer:

Keil MDK Nuvoton Edition - Full Cortex-M requires with using Arm Compiler 6.

Q2: How to check the compiler version?

Answer:

Open “Options for Target…” and choose the “Target” tab, the Arm Compiler options can be set in the Code Generation block.