Have you installed the Arm compiler: https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-rm/downloads?
If you try adding the folder with the compiler binaries to your path: https://helpdeskgeek.com/windows-10/add-windows-path-environment-variable/. There’s a checkbox with on the arm compiler installer, but I find it doesn’t always work.
Alex