what is mackeeper

It's absolute junk, from an unethical company. See Beware MacKeeper.

(Note that my pages contain links to other pages that promote my services, and this should not be taken as an endorsement of my services by Apple.)

johnfrommilwaukee wrote:

...should I download it?

Only if you want to mess up your machine.

http://applehelpwriter.com/2011/09/21/how-to-uninstall-mackeeper-malware/

Mackeeper is software that you give to your enemies.

Ciao.