What does "Lifetime Upgrade Plan" mean?

After you purchased "Lifetime Upgrade Plan" license, a Download Key is instantly sent to you by email, with which you can always download the latest full version of CleanCenter in lifetime.

What does "One Year Upgrade Plan" mean?

After you purchased "One Year Upgrade Plan" license, a Download Key is instantly sent to you by email, with which you can always download the latest full version of CleanCenter in 365 days.