Here's a good step by step guide: [http://www.tomsguide.com/us/upgrade-snow-leopard-mavericks,news-18388.html|How to Upgrade Snow Leopard to OS X Mavericks]. You will need a good internet connection! I strongly recommend an Ethernet connection Vs WiFi.
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If you still 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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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.
Here's a good step by step guide: [http://www.tomsguide.com/us/upgrade-snow-leopard-mavericks,news-18388.html|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 still 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.