You want to apply the latest patch to the .Net Connector version that you have. For example: you are using .NCo 3.0.14 and want to intall the latest available patch (3.0.19 on October 2017).
.NET Connector 3.0
SAP Connector for Microsoft .NET 3.0, NCo, NCo 3.0, .NET Connector, dot net connector, SAP_DotNetConnector3_Net20_x86, SAP_DotNetConnector3_Net40_x86, SAP_DotNetConnector3_Net20_x64, SAP_DotNetConnector3_Net40_x64, libicudecnumber.dll, rscp4n.dll, sapnco.dll, sapnco_utils.dll, , KBA , BC-MID-CON-NCO , SAP .Net Connector , How To
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