I have licensing issue. Subscription with vmware end 10 months ago. Now I want to upgrade vsphere 4.1 to vsphere 5.0 (same edition). I don't have valid subscription, now. What I need to do to be compliant with licensing model? Can I buy only subscription?
Please take a look at http://www.vmware.com/products/vsphere/upgrade-center/licensing.html for the options you have.
If your support and subscription has expired prior to the GA date you can choose to reinstate it later. If you do so, you will be eligible to upgrade to VMware vSphere 5 licenses at that time.