Can I update my OS from Sierra to High Sierra on my older Imac 2011 10.12.6 ??

Yes. Back up your data, check your applications for compatibility, and click on High Sierra.

(206950)

Looking to update my OS from Sierra 10.12.6 on 21.5 inch intel i5 iMac 2011

Tried the link above but nothing shows in iTunes

Is it possible or even a good idea... I was wanting to update because I have been having some issues with Safari

If you were trying to open it in Firefox, use a different web browser. Otherwise, click on it again now.

(207824)