software update issues

Open the Mac App Store and try downloading Yosemite. If you get told it's incompatible, choose About this Mac from the Apple menu, check if the computer has at least a Xeon or Core 2 Duo(not Core Duo) CPU and 2GB of RAM, and if it does, click here and order a download code for Lion 10.7.

Back up your data and check your applications for compatibility before upgrading. In particular, Mac OS X 10.7 and newer don't support PowerPC programs such as versions of Microsoft Office prior to 2008.

The Software Update pane of System Preferences doesn’t show full version OS upgrades, and Mavericks is no longer available.

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so... what if it is a 2 gzh intel core 2 duo but only 1 gb 667 MHz DDR2 SDRAM would it be to weak ?

You need to install at least another 1GB of RAM, and should install more than that. If your Mac supports it, install a 4GB or larger module.

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