nRF51-DK + Keil MDK, how to build the example, - peripheral - bsp ??????? like a garbage development environment

I'm a super beginner in nRF51-DK + nRF SDK 12.3.0

I can't build the example, uart and bsp in SDK, both SES and Keil MDK.

1. Installed Keil MDK (not yet licensed ) 

2. copied bsp_pca10028 from Pack Installer

3. tried to build project and faced problems continuously.

 - default compiler version 5 ??? 

 - changed compiler version

 - other problem, ArmClang: error: unsupported option '--99', changed option to default and deleted --99

    

 - another problem, ???  ㅡㅡ; 

is there any correct information ???

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