How do I update to Safari 15 on an iMac computer?
How do I update to Safari 15 on a late 2012 Mac Desktop?
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The way Safari is updated is by upgrading your computer's software. An upgrade is when you install a newer version, such as upgrading from Catalina to Big Sur. An update is to install a newer version of the same operating system. The reason for this is because Safari is installed as part of the operating system. It cannot normally be individually installed. Incidentally, a newer version of Safari does not always work with every web site. Sometimes it is necessary to install another browser such as Firefox or Chrome to use with certain web sites. They are individually installed and upgraded.
So, the latest Safari version is installed when you upgrade the OS on your iMac.
A late 2012 through late-2013 iMac can be upgraded to Catalina 10.15.7. See: https://support.apple.com/en-us/HT211683