MacBook (13-inch Aluminum, Late 2008) Mac OS version 10.7.5, 2GB RAM and more than 50 GB disk space. I am not able to update to OS X Mavericks. ANY REASON?

what happens when you try? any error messages?

Rgoyal --

You're OK for everything except RAM. You need at least 4 GB.

Here's the FAQ from Apple:

OS X Mavericks: System Requirements

Learn about the system requirements for OS X Mavericks

To install Mavericks, you need one of these Macs:

• iMac (Mid-2007 or later)
• MacBook (13-inch Aluminum, Late 2008), (13-inch, Early 2009 or later)
• MacBook Pro (13-inch, Mid-2009 or later),
• MacBook Pro (15-inch or 17-inch, Mid/Late 2007 or later)
• MacBook Air (Late 2008 or later)
• Mac mini (Early 2009 or later)
• Mac Pro (Early 2008 or later)
• Xserve (Early 2009)

Your Mac also needs:

• OS X Mountain Lion, Lion, or Snow Leopard v10.6.8 already installed
• 2 GB or more of memory
• 8 GB or more of available space

Check that your computer is compatible with Mountain Lion/Mavericks.

To check the model number hold down the option/alt key, go to the Apple menu and select System Information.

• MacBook (Late 2008 Aluminum, or Early 2009 or newer) model number 5,1 or higher
• MacBook Pro (Mid/Late 2007 or newer) model number 3,1 or higher