I have OsX 10.6.8, and imac 2007-08, and enough disk space to download yosemite but still Apple tells something is wrong and generates a list of maybes but not a specific reason. Any ides as to how to pin point the problem of the upgrade?

Want to upgrade from 10.6.8 to yosemite  and I have a imac 2007, and enough disk space. but when trying to download, I get a "I can't" due to a list of possible issues, but how to isolate the problem?
Thanks,
josefromaptos

Check that your computer is compatible with Mountain Lion/Mavericks/Yosemite.
To check the model number hold down the option/alt key, go to the Apple menu and select System Information.
iMac (Mid 2007 or newer) model number 7,1 or higher
Your Mac needs:
OS X v10.6.8 or OS X Lion already installed
2 GB or more of memory (More is better - 4 GB minimum seems to be the consensus)
8 GB or more of available space
Check to make sure your applications are compatible. PowerPC applications are no longer supported after 10.6.      
Application Compatibility
Applications Compatibility (2)
Do a backup before installing.
If you can/do upgrade, I recommend you make a copy of the installer and move it out of your Applications folder. The installer self-destructs. The copy will keep you from having to download the installer again.  You can make a bootable USB stick to install using this free program.
Bootable USB Flash Drive – Diskmaker X

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