The version of your XProtect Smart Client affects which XProtect server version it is compatible with. The latest XProtect Smart Client is compatible with the latest server version and the previous server version. For example, XProtect Smart Client 6.0 is compatible with XProtect Enterprise 8.0, XProtect Enterprise 7.0, XProtect Corporate 4.0, and XProtect Corporate 3.1. However, an older version of the XProtect Smart Client is not compatible with the latest server version, for example, XProtect Smart Client 5.5 is not compatible with XProtect Enterprise 8.0. The XProtect Smart Client plug-in for XProtect Analytics can only run on a 32-bit version of the XProtect Smart Client. The plug-in cannot run on a 64-bit installation.