What's the latest MacOS i can install on my iMac?
What is the last version (the more reliable) of macOS we can install on this iMac???
[Re-Titled by Moderator]
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10.13.6 is the highest that Mac will support...
Mostly you just need a more modern Browser than Safari on Mojave, or High Sierra like Firefox or Brave.
Opera…
https://www.opera.com/download/requirements
Opera system requirements | Opera
Thanks to dialabrain…
Firefox 112 is now the current version. runs in High Sierra.
https://www.mozilla.org/en-US/firefox/new/
Look into the Free LibreOffice, it handles MS Office files like Word & Excel, & Page Layout…