I have a unlimited license  but i get this mail:

 
This message is to inform you that Centova Cast was unable to validate your
license key with the Centova Cast licensing servers.

CENTOVA CAST WILL STOP OPERATING IN 1 DAYS IF YOU DO NOT TAKE
ACTION.

It is imperative that you contact the Centova Cast support department for
assistance as soon as possible to have this issue resolved. Without license
validation, Centova Cast will cease to operate on 2012-02-22. On
this date, any attempt to login to Centova Cast will result in a licensing
error.

The nature of the error is as follows -- please report this to the support
department when opening a support ticket:

Invalid key received from licensing server

Please login to your client area at centova.com.
Click "Manage Product Licenses" and select your Centova Cast license.
Click the "Re-issue license key" link. (See the section below if you do not see a "Re-issue license key" link.)
This will authorize the reissuance request on our end. Next, you just need to tell Centova Cast to request a new license. Login to your server via SSH and run:

/home/centovacast/system/runascc/runascc exec ccmanage reissuelicense hostname.com

Please make sure to replace hostname.com with the actual domain name for which you registered your Centova Cast license.
Note: The above line may appear word-wrapped, but it should all be entered on a single line.