You can use it for free on a one-time basis if your Mac is already infected. If you haven't already heard of Malwarebytes, it's an anti-virus program that detects unwanted leftover bits of coding that can oftentimes be left behind, even when you think you've deleted the offending program.
I had already tried to delete Mac Auto Fixer manually but was pretty sure there were probably some hidden remnants. Within a few hours, the folks at Malwarebytes responded, 'Thanks for the heads-up! We're detecting that now.' How to remove Mac Auto Fixer It showed update and downloaded Mac Auto Fixer.' In addition, a search of included a forum post from a user who reported 'I had Advanced Mac Cleaner on my research VM. A little more searching about Mac Tonic brought up web pages about how to delete it as well as links to third-party software that would also do the trick. It appears that Mac Auto Fixer is a reincarnation of that former app, since the verbiage on the websites for the two products is in large part the same. Web search research for Mac Auto Fixer also turned up a link to a product called Mac Tonic. Mac Auto Fixer advertises itself on its website as a 'Cleanup Utility for Mac'. VPN Deals: Lifetime license for $16, monthly plans at $1 & more