This issue occurs in C# Sample Application
Unable to load DLL 'RS_SDK.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E)
Than check the RS_SDK.DLL that using in the application.
If your application setting is x64 than use x64 RS_SDK.dll
or
If your application setting is x86 bit than use x86 RS_SDK.dll
Use DLL from this location C:\Program Files\Xperix\RealScanSDK\Bin\x64