zakeus wrote:
Hi Eric, as unconvincing I may sound. I bought a Mac Desktop from a craglist buyer for 200 in Atlanta not knowing anything about him deleting and cleaning the whole hard drive. I'm a new Apple user. I have never downloaded Mavericks, Is there anyway I could use your Apple Id only to download the Mavericks? If not, trust me I understand.
No way should anyone give your their Apple ID so you can download an OS X version. Nor should you accept an OS X installer from a source other than Apple, as you do not know how it has been modified (they have been known to be preloaded with malware), plus the installer is signed with the Apple ID of the person that downloaded it.
Depending on the Mac model, it is very possible you can use Internet Recovery - Boot holding Command+Option+R
<http://osxdaily.com/2014/12/14/reinstall-os-x-mac-internet-recovery/>
You could also make a Genius Bar appointment at your local Apple Store and they should help you install OS X. They might even help you install Mavericks (10.9), HOWEVER, if you can run Mavericks, you can run El Capitan (10.11), which is the current release.
Finally, if you are new to Macs, then PLEASE do not treat your Mac like Windows. Please DO NOT start installing anti-virus, please do not start installing Mac cleaner/maintenance utilities, please do not install performance enhancing utilities. They all then to cause more problems then they solve, and often cause you to come back to the forums seeking more help that you could have avoided by not installing this class of software.