The core parking tool is obsolete. It's looking at an old reg key associated with an old core parking system found in Win 7 and 8.1. It's not required for Win 10. To verify, resource monitor should be checked to find the core parking status. You'll find not a single core is "parked". However, Win 10 has it's own version of core parking, kind of. To disable it, set your Windows power plan to "High Performance".
Intel Core i9 9900K HT 5GHz
GIGABYTE Z390 Ultra
Nvidia MSI Trio-X RTX 2080 Super
G-Skill Trident 2x8GB DDR4 4000MHz
Samsung EVO PLUS NVM.e 500GB
SeaSonic 1250W Gold
Tt Core-X71 + Custom Loop.