Stop Replication Agent and quiesce Replication Server to purge all inbound queues.
Replication Server 15.7.1 SP100 is available on 64-bit and 32-bit platforms for Windows.Therefore, upgrading to version 15.7.1 SP100 may include upgrading from a 32-bit platform which requires a purge of inbound queues. See the Replication Server Release Bulletin for supported 64-bit platforms.