Need updating help... Have 10.10.5 need 10.11 or higher

Hey guys, I am new here... I need to update my adobe premiere cc and i need 10.11 or higher... thus being naive i did a system update via apple app store to high sierra... Well nothing changed except i lost my sound and it says 10.10.5 still... I tried downloading Capitan from a link i found and it says it cannot be installed on my computer... please help! I use my hack for work so I need it to work or i am screwed!

submitted by /u/KirbyPro
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