10.5.1. We will be going 10.7.1/10.8 a few months in to next year. I hope a large-number change to hot fix an issue like this is not needed though if it is in fact a bug.
However that patch is unrelated, as it is specific to Create Address Locator and Pro. It appears that is to fix the problems I found with Create Address Locator tool and the Ghost result bug in Suggestions.