All my software is outdated, including my OS, so I need to update them all

When I try to do anything

the apple developer program is telling me, i need the latest version of MAC OS, latest version of XCODE, latest version of Unity , latest version of IOS in my iphone before i can do anything, so the first step is to update all

My Mac version is now 10.7.3 which is too old, need to update to new one 10.9 (236 MB) oh well....

just wait

after I update my Mac version, i will need to update my XCODE from version 4.3.3 to 5.1.1