how i update softwear from elcapitan to sierra

The Age of this computer will Govern what newer version of macOS it will Qualify to install. Use About this Mac from the Apple Icon on Desktop - the required Information will be there.

With the above information in-hand - follow this How to get old versions of macOS and verify what version this computer Qualifies to install.  For Best results use Safari to commence the download as Others may not work.

Safari will open a redirect and open the Apple Store where the download can commence.

macOS Sierra 10.12 hardware requirements

The Sierra download will come as a DMG file.

Double click the DMG and it will open another windows with a PKG file appearing.

Double Click the PKG file and that will install a New Application in Applications folder called " Install Sierra.

Double click the Install Sierra and that will commence the installation.

Back up your data, check your applications for compatibility, and if your Mac model is recent enough, click on Sierra.

To check the programs, click here and look them up.

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