OPC Core Components are required for OPC servers and OPC clients to run. If the server and the client are installed on different computers, this package must be installed on both computers. If the client or the server runs on a 64-bit version of the operating system and they are 64-bit applications, you need to install the corresponding version of OPC Core Components.
You can download OPC Core Components free of charge from opcfoundation.org.
Fig. 1 Website section with necessary libraries
After you download the libraries, you should install them. You need installed .Net Framework v1 to be able to install the libraries.
Note: It is recommended to restart the computer after you install OPC Core Components.