My owned license errors out "fail to decrypt license key received" on an old LSWS version

A user's owned license was purchased a couple year ago and the upgrade has been expired so the user can only use LSWS up to 5.2.8. LiteSpeed introduced some new license types and the user has upgraded his old owned license to equivalent new license type. When the user tried to use the license on a 5.2.8 binary and it came with an error:[ERROR][LICENSE]Failed to decrypt license key received!

Why such error?

New LiteSpeed license type can only be used on 5.3+ version and can not be used on 5.2.x and below. The above error simply means “old binary cannot work with new license type”. On our store, we listed clearly, new 5.3+ will support the new license type. the new type license.key has new encryption, only 5.3+ binary can decrypt it. The user should not upgrade the license type from own one to new one if he has not made any plan to upgrade the server to 5.3.x and above version.

There are two options for the user to solve the problem:

1. Purchase yearly upgrade so that he can install the latest version of LSWS
2. Reverse back the license from the new type to old one( the user can log in to the account and do so) if the user does not want to upgrade LSWS at the time being.