Safari
I have a 2009 MacBook Pro, trying to download Safari 11.1.2
MacBook Pro 13″, OS X 10.11
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A 2009 MacBook Pro can be updated to OS X 10.11.6 "El Capitan" which will incorporate the latest version of Safari it can run. To determine which macOS version you are using, read Find out which macOS your Mac is using - Apple Support.
How to get old versions of macOS - Apple Support describes how to obtain El Capitan, if that Mac is running an earlier version.