Hello Ken,
Yes, the KSDK1.3 is the latest version now , and it have not support the board of TWR-K60120M.
I think you can also use the Processor Expert driver to development your project , and there are the component of
peripherals , it only need add them you need .
If you want use , when you create project , please select it :

For example , if you want use the print words through UART , you only need add the component of "ConsoleIO":

Hope it helps
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Have a great day,
Alice