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I haven't been using the laptop for some time.
AsI can see I have Catalina OS and there are no updates available.
Still, when I try to install some apps (e.g. Keynote) it says that my lap-top is not supporting it.
Is there anything I can so?
[Re-Titled by Moderator]
Earlier displays & monitors
Some vendors like Adobe and Microsoft have a policy of supporting only the most recent three versions of macOS. Currently, those are Ventura, Sonoma, and Sequoia. Catalina is three major versions behind Ventura, so it has been off the "most recent three" list for about three years.
Apple seems to be getting even more aggressive with some of its programs. Current App Store versions of Pages, Numbers, and Keynote require macOS 14.0 (Sonoma) or later – not "most recent three", but "most recent two"!!!
Catalina is still good enough to run current versions of
These may help to substitute for some of the things that you can't get.
If this MacBook Air is running Catalina, but cannot update past it, that would identify it as being an 11" or 13" Mid 2012 model. Those have SSDs, 4 or 8 GB of soldered-in RAM, USB 3.0 ports, and non-Retina screens. They can drive an external display with a resolution of up to 2560x1600 pixels over their Thunderbolt 1 port (which has the same connector as a Mini DisplayPort and can double as one).
At some point, you might want to consider replacing it with a newer Mac. A modern Apple Silicon MacBook Air or MacBook Pro could offer many upgrades, including
not really, it can't be upgraded to newer macOS versions, and it's up to the app developers which os versions they wish to support
you can try out LibreOffice it has a presenter app which would likely read and write keynote files and powerpoint for that matter
Why is my MacBook Air not supporting new applications
