DLL deployment is simply putting the ProEssentials DLL into your setup script so that it's installed with your application.  Whether you implemented a pure DLL solution or used the WinUI, WPF, WinForm, WebForm, ActiveX, or VCL interfaces, you must always distribute a DLL with your application (The exception is our .NET AnyCpu assemblies, which embed the engine and self-extract it at run time, so no additional DLL is distributed with them: the .NET48 .NET 8 and .NET 10 AnyCpu assemblies extract it under its real name matching the process - PEGRP64I.DLL, PEGRP32I.DLL, or PEGRPARM64I.DLL - while the .NET Framework 4.8 AnyCpu assembly extracts it under the generic name PEGRPI.DLL.)

Found in the System32 folder and in the ProEssentials11\x64 and ProEssentials11\Arm64 folders. 

Found in the SysWow64 folder and in the ProEssentials11\x86 folder.
Deploy into same folder as your EXE.