Dear, I have Plesk 7.5 fro windows in my office with unlimited domains and lifetime license, but now it can not get license key update from Plesk servers, and it keep said : Unable to update key. An error occured while processing your key. You can try to update it later. Unable to update key: (0) Failed to parse XML-RPC request: Failed to parse boolean value: false. Now the control panel is running on grace period. Please help me anyone.