How to download the full game of minecraft without paying for it?

Search in YouTube how to download minecraft private server full works 100%

You don't, you pay for it just like everybody else.

You find a Youtube video that will tell you, install it and enjoy while most likely the user that provided the tutorial embedded some kind of malware, spyware, or trojan into your computer which will end up costing you far more to fix than it's worth.