Update software version for late 2009 apple os x El Capitan 10.11.6
What is the current update for os x El Capitain 10.11.6 for an iMac late 2009
iMac, OS X 10.11
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Instead of update do you mean upgrade, an upgrade is moving from one OS to a newer OS.
The late 2009 iMac can upgrade to macOS High Sierra, not any further.
Please use Safari and click on the link below, Firefox will not work.
How to upgrade to macOS High Sierra - Apple Support
Before upgrading make a full back up of your Mac.
Check that third party apps you use have updates available for the new OS.
Check that your printers/ scanners etc have updated drivers and software available for the new OS.
Connect your mac to your router via cable rather than rely on WiFi.
Do not use your mac while it is downloading
and do not use any other devices that share the same internet connection.
If the App Store says Open then it is detecting a previous download of the install app
go to the Applications folder locate Install macOS High Sierra.app.
Move it to the Trash, empty the Trash.
Restart, click on the link again, the App Store should say ‘Get' or 'Download'.