Hi YUKIABE-9181,
The Group Policy solution shouldn´t work on the professional SKU. Group Policy requires Enterprise..
Applocker on Professional needs the CSP which is not that easy to apply.
https://learn.microsoft.com/en-us/windows/security/threat-protection/windows-defender-application-control/applocker/requirements-to-use-applocker
See the notes:
[...] You can only manage AppLocker with Group Policy on devices running Windows 10 Enterprise,
https://msendpointmgr.com/2020/09/20/does-applocker-work-in-windows-10-pro-yes-it-does/
You can use Software Restriction Policies on Professional.
Mark