We're running Plesk 8.1.1 and centos4.8 and we haven't upgraded the license for a while. We like to upgrade to centos 5.x. We've seen plesk 8.1.1 is not supported by centos5.x and therefor we need to upgrade at least to 8.2.x. Is this possible without any additional costs? Or do I need to renew my license?