If you prefer not to edit Hex code manually, is a popular open-source "wrapper" that sits between the Service Control Manager and TermService. It does not modify the original termsrv.dll . It uses an .ini file to apply the patch in memory.
, effectively bypassing the default limit of two simultaneous administrative sessions without requiring expensive Remote Desktop Services (RDS) Client Access Licenses (CALs). windows server 2019 termsrvdll patch top