could you please tell me how to up date my Mac OS El Capitan to High Seira . my computer is Mac book pro 17' Late 20112 .thanks

1.  Check compatibility

      To confirm compatibility before downloading, check the minimum requirements for

       macOS Catalina, Mojave, High Sierra, Sierra, El Capitan, or Yosemite.

      You can also find compatibility information on the product-ID page for

       MacBook Pro, MacBook Air, MacBook, iMac, Mac mini, or Mac Pro.

      Applications compatibility: https://roaringapps.com

2   For older version of  macOS:

     Please read this section carefully

      Section: Download macOS

      https://support.apple.com/en-us/HT211683

     Install macOS upgrade.

     https://support.apple.com/en-us/HT201475

belfastni wrote:

could you please tell me how to up date my Mac OS El Capitan to High Seira . my computer is Mac book pro 17' Late 2011 .

thanks

older macOS installer backups on this server:

https://support.apple.com/en-gb/HT211683

verify you are using the Safari browser to download/initiate the macOS links.