OS X 10.8.5 Supplemental Update 1.0 for Mac can be downloaded from our software library for free. The program is included in System Tools. Our antivirus scan shows that this Mac download is malware free. The latest setup file that can be downloaded is 18.8 MB in size. This Mac app was originally developed by Apple, Inc. Download Mac OS X Mountain Lion 10.8.5 latest version standalone offline DMG image for your Apple computer. Mac OS X Mountain Lion 10.8.5 is a very powerful and reliable operating system for your Macintosh computer with different enhancements and improvements.
now I cannot install anything from app store because all of them need new version of OS ,
also I cannot install any version of newer OS .
I decided to upgrade OS step by step , I search OS Mavericks in app store but it doesn't show anything , I searched in google and downloaded 10.9.5 and other update versions , but it says you should have 10.9 first .
also when I click on ' software update ' it says ' No updates available '