You can't tell the OS to never show you any of the raw updates, but if this one keeps reappearing, you can manually install it by downloading here https://support.apple.com/kb/DL1882 and then it'll install properly and go away.
You can't tell the OS to never show you any of the raw updates, but if this one keeps reappearing, you can manually install it by downloading here https://support.apple.com/kb/DL1882 and then it'll install properly and go away.
It's not that the App Store doesn't install it correctly, it's that there's another update usually within a day or two of the last one. It seems like all but the most professional DSLR photography pros would care about (every single one of) these updates. I do install them to make it go away, but I don't use my Mac for photography so it's more of a nuisance than anything.
You're misremembering how frequent the updates are:
6.17 released October 19, 2015
6.18 released December 14, 2015
6.19 released April 21, 2016
6.20 released June 23, 2016.
They're typically released no more frequently than about every 2 months.