Download older versions of ue4?

On New Version (2021) atfer Launch, see Unreal Engine, choose this option and later “Library”. There is the symbol “+” , click it to appear old versions to Install.

Unreal Engine shows me the add button, but it denies from pressing it to add older versions of unreal engine. How do I solve this problem?

the year is 2022 i am also feel like stupid but don t be feel like it you are not alone