The latest patch for Clickschedule 2.3 is available from SAP Support portal.
It can be downloaded from the following link:
-> Support Packages and Patches – Entry by Application Group
-> SAP Solution Extensions by Partners
-> SAP WS&O BY CLICKSOFTWARE
-> SAP WS&O BY CLICKSOFTWARE 2.3
In case of any issues or questions please open a support incident under XX-PART-CLK via http://support.sap.com/incident