MacKeeper is an application that should be avoided at all costs.
At best it is a scam and at worst it is an insidious piece of malware!
Step away from any offer from MacKeeper.
It's always a malware. I uninstalled it already 3 years ago for this very reason, and I was stupid enough to re-download it in its now upgraded design and with technician-chat version. Things don't change: it's always a virus, as it was from the beginning. It hangs itself, and leaves computer hung. Their $514 yearly subscription for "Mac-authorized remote assistance" is just a practical joke.