The major upgrade of Blue-Cloner is based on an annual. The new customers purchasing Blue-Cloner will get one-year free upgrade service. If you purchased Blue-Cloner within one year, you can upgrade to Blue-Cloner 4 for free. If it exceeds one year, you should pay for the next year's upgrade service. During this year, you will get one major version upgrade and several minor upgrades. If you do not want to upgrade, you can still use the original version without time limit.