Cite from Fix Readme:
Prerequisite: The Sametime System Console must be at version 8.5.2 IFR 1. If not, then you will see a failure message during the fix install noting an incorrect version level. Refer to Installing Sametime 8.5.2 Interim Feature Release 1 on the Sametime System Console to get started.
This fix must be installed on top of a Sametime Proxy Server 8.5.2 Interim Feature Release 1 (IFR 1). If the server is running 8.5.2 (without the IFR 1 fix), then the IFR 1 fix will be automatically installed.