There's a critical exploit in the iOS Mail app that was just recently patched in iOS versions 13.5 and 12.4.7. (BTW, if you haven't updated your iOS version to either of these builds, you should disable the Mail app on your iPhone as an interim fix to avoid getting pwned.)
iOS 12.4.7 was supposedly pushed out for older devices that are incompatible with iOS 13.
I am using an iPhone 6s, running iOS 12.4.1. Checking for Software Updates via Settings app → General → Software Update only offers to install iOS 13.5.
I assume there must be some sort of download link where I can get an iOS 12.4.7 installer package and load it onto my phone via iTunes, although I wasn't able to find one.
Is there a way to install iOS 12.4.7 on iPhone 6s?
IMPORTANT: For anyone who didn't know, there's a big difference between the iPhone 6s and the original iPhone 6. The 6s has significantly improved hardware specs, most importantly double the RAM (https://www.theverge.com/2015/9/26/9401563/iphone-6s-teardown-ram-confirmed-2gb) which often makes the difference between "running the latest apps properly" and "puzzling, bizarre random crashes".