For simple shrinking or extending of volumes, the built-in Windows tool (Right-click "This PC" > Manage > Disk Management) is free and requires no installation.
While convenient, unofficial portable activators are highly dangerous because they are created by unknown third parties who modify the original source code. The Dangers of Using Cracked Partition Software
: Includes "AI smart space adjustment" to automatically optimize disk space and fix "low disk space" errors on C: drives.