Resolved! BUG: SW4STM32 won't compile Nucleo-STM32G474 : get a fatal error: cmsis_os2.h: No such file or directory . See attached screen shot).
Making a port from F334 to G474 controller, used CubeMx 5.3 to do 1 PWM using HRTIM CHA 50% duty as a test and got a this error during compile.