Because v2.5.3 is a historical artifact, its compatibility is strict. It does not work natively with Windows 11 version 22H2+ or modern Microsoft 365 Click-to-Run apps unless heavily modified (which usually introduces malware risks).
(2003 to 2016). It functions by emulating a Key Management Service (KMS) server on your local machine to bypass standard activation requirements. Core Functionality microsoft toolkit v253