10.5.8 to 10.6 without buying anything
bought a macbook laptop in April of '08, still working well, but suddenly needs me to do an update it never warned me about so it can open the internet. I'm running 10.5.8, and it says it needs 10.6 or newer but I don't know how to get it and am not willing to pay for an update that should have been able to take place internally. Send help.
MacBook (13-inch Early 2008)