When you see the term "REPACK" attached to software like Pluto Manager, it refers to a specific type of distribution. A repack is a compressed version of the original installer, often created by third-party groups.
The "Registration Key" is the digital "password" that upgrades the software from a trial version to a "Pro" or "Full" version. In a "REPACK" scenario, the registration process usually happens in one of three ways: Pluto Manager Registration Key REPACK