Islam,
Licensing is tied to the (V)UDI of the NCS. If you have 1.0, you should upgrade to 1.1 using the NCS-upgrade package, not install 1.1 fresh with a new OVA.
If you are already on a new 1.1 OVA and you don't have your old 1.0 install anymore, then you will need to have Cisco Licensing regenerate your license file.
Regenerations are limited on NCS to, I think, 2 or 3, so don't do this too often.
Detailed upgrade instructions and explanations of UDI and VUDI are in the 1.1 release notes.
Justin
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