If you are looking for free ways to manage and optimize your PC without the risks of pirated software, consider these official tools:

Unauthorized modifications to system utilities can cause critical errors in the Windows registry, potentially making the OS unbootable.

Windows 10 Manager is a legitimate all-in-one system utility designed to optimize, tweak, and clean your Windows operating system.

A safe way to batch-install popular free software without manual input. Windows management - Microsoft Community Hub

Users often find it useful for managing startup items and cleaning the registry, though the performance gains from registry cleaning can be negligible for most modern systems.

Searching for "cracks" or "serial keys" for (a legitimate utility by Yamicsoft) typically leads to high-risk websites that often distribute malware, ransomware, or spyware bundled with the "download". Review of Windows 10 Manager