can someone please show a way updating my wallet to the latest...i mean i just need to replace the wallet.dat file??or is more complecated??and i want also to setup 12 masternodes !! can this be done by me on windows just following the guides or i do need help?
You have this kind of money and lack of basic knowledge about crypto?
No offence but gain some
i bought dark on early days and i holded them until now without selling on the first peak as i said i have some experience and i think i can handle things but i allways ask to confirm because as i said im not an expert on the field..im better on investing than developing

There are a ton of guides on how to do it. You should try to get an understanding of how it works and if you are still not comfortable, pay someone to do it for you.
https://darkcointalk.org/forums/guides.32/Yeah, pick one out and read through it a couple times. First time through it looks confusing as crap, read through it couple more times and you start to realize you don't quite need to understand everything to pull it off, mostly copying and pasting to the proper place. It's really not so bad, and the stuff you learn from it is very useful knowledge to have.