DLL's problem for SAP 7.50

We have WINDOWS based tool developed on C# we use below DLL’s for SAP RFC Call ( RFC_READ_TABLE)

• 1.sapnco.dll
• 2.sapnco_utils.dll

since it is a WINDOWS based application to make the SAP RFC call successfully happen user should install SAP GUI software on his laptop.

After the update of the SAP GUI software from 7.40 to 7.50 version users is facing problem to logon to the tool , after our analysis we have understood that RFC call is not happening successfully our suspect would be the DLL's since we our using the older version

Can any one of you share the SAPNCO.DLL & SAPNCO_UTILS.DLL .net connectors which is compatible for SAP GUI 7.50

Request you to help me