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モデル番号A1286、発売日 2011年2月/2.0, 2.2もしくは2.3 GHzクアッドコアIntel Core i7プロセッサ

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Can't upgrade from version 10.6.8

i have mac os x version 10.6.8 and my mac keeps telling me that i cannot upgrade/install upgrades for my mac

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Please give us the last four figures of your serial number so we can tell your your exact machine and how far it can be upgraded.

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Here's a good step by step guide: How to Upgrade Snow Leopard to OS X Mavericks. You will need a good internet connection! I strongly recommend an Ethernet connection Vs WiFi.

If you can't get it to install I suspect your drives format is not compatible (has HFS Vs GUID). You'll need to first backup your stuff onto an external drive then booting up with an external bootable drive reformat your internal drive so it has a GUID partition map and has a Mac OS Extended (Journaled) formatted partition to install a fresh copy of your OS (Snow Leopard) so you can then install the upgrade. You don't need to boot up under your internal drive if your bootable volume you are using is already Mavericks or newer.

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personally I don't like updating OSX via the update module, it leaves redundant files and slows down your computer for future use.

here is what I do:

back up to HD to external drive:

Power on & hit and hold "option" key, wait until disks appear

insert bootable USB El Capitan,

go to disk utility and delete your hard drive completely

then proceed with install

Diskmakerx is an easy way to create a bootable OSX ... google it.

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Fresh installs won't leave redundant files. Even upgrading doesn't really, it's the location the files are located on your HD that slows the system down (fragmentation). As you upgrade the OS core files tend to fragment which is the root issue. I always defragment the drive after an upgrade. The last issue is the OS's indexer needs a chance to clean up the index. So give your system some time to clean its self up.

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The only real issue here if you had lots of programs that you have deleted which has left a lot of junk. Then doing a clean install will get rid of this loose stuff or you could just use an orphan file cleaner.

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Jack Grizzly さん、ありがとうございました!
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