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Upgrade API Buffer Server to PI Buffer Subsystem. This video walks through the steps required on a client machine. It talks about versions BufServ v184.108.40.206 to PIBufss v4.3, which you can use an intermediate step to upgrade and then jump to the required version of PI Bufss or refer to PI Bufss documentation to directly jump to higher versions.
KB01208 - How to install the latest version of the PI Buffer Subsystem (PIBufss)
The PI Interface Configuration Utility (PI ICU) has the PI Buffer Subsystem packaged along with it.