How do I download macOS 10.15 on my iMac?
I can't even use my browsers anymore because I have an older OS (El Capitan)
[Re-Titled by Moderator]
iMac 21.5″, OS X 10.11
Question marked as
If your Mac is compatible, you would upgrade directly to 10.15.7 or a later macOS version; you wouldn't first upgrade to 10.15 and then to 10.15.7.
The model year of an iMac is available at Apple menu > About This Mac.
An early 2009 iMac can be upgraded to El Capitan 10.11.6 but no later version
A late 2009 through mid 2011 iMac can be upgraded to High Sierra 10.13.6 but no later version.
A late 2012 through late 2013 iMac can be upgraded to Catalina 10.15.7 but no later.
A mid 2014 and late 2014 iMac can be upgraded to the latest version of Big Sur macOS 11 but no later.
A late 2015 iMac can be upgraded to the latest version of Monterey macOS 12 but no later.
A 2017 iMac can be upgraded to the latest version of Ventura macOS 13 but no later.
For all of the above, see instructions in: How to download and install macOS - Apple Support
A 2019 or later iMac can be upgraded to the current version of Sonoma macOS 14. See:How to upgrade to macOS Sonoma - Apple Support
Be aware that if you upgrade to Catalina 10.15 or later you will also need to update any non-Apple 32-bit apps. See: https://www.stclairsoft.com/Go64/
or
https://www.macworld.com/article/232735/how-to-check-if-mac-software-is-32-or-64-bit.html