trouble in update From mac OS X El Capitan Version 10.11.6 ----TO---- > macOS Sierra 10.12.6 - macos-sierra

i have question that in my mac currently i am having mac OS X El Capitan Version 10.11.6 and now i want to update it with mac Download macOS Sierra 10.12.6
now, i have .dmg file of macOS Sierra 10.12.6 but when i am going to download it gives me error that
now i find a lot .dmg of version 10.12 but i didn't get anywhere then i got version 10.12.1
now i am confuse that do i compulsory need to fine 10.12 and install it and than after update 10.12.4 and than after 10.12.6 ?
pls provide me detail information about it.
Thanks For your precise support.

after so many confusion and question i find the correct answer.
this is the answer only for who are confuse and i am trying to draft this message for whom who is truely required.
now, answer is
If you have mac OS X El Capitan than
GOTO > AppStore > download & update : https://developer.apple.com/macos/
now after update your os
you can update your xcode from below link
https://itunes.apple.com/in/app/xcode/id497799835?mt=12
Thank you friends..

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Take a snapshot of your Mac OS VM in case something goes arigh
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Download the combo update from apple's official site and run
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Change the date to 01/01/2012 (this is because of an expired cert check that is checked during the install)
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I am newbie to iphone programming and trying to learn iphone programming.I need experts help.Please forgive me if its repeat question.
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regards,
Sunny
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