Hi There, does anyone know whether it is possible to install Snow Leopard (10.6) on a 2009 MacBook Pro 17 (unibody) with leopard on it via the DVD, delivered with a late 2009 Macbook Pro 13 (unibody) (delivered with Snow Leopard)? When I insert the disk it shows me the install icon of Snow Leopard but I didn't dare clicking on it because I wasn't sure whether it would work or what would happen if not. I know it might infringe the license agreement, but I just wanted to know. Would it also work on a 2008 iMac 20" (aluminium) (10.5 installed now)? Thank you for an answer.