HORIZONT products are available for all major TWS versions (TWS 8.1 - TWS 8.3), for further information see:
TWS 8.1 - HORIZONT products availability list 
TWS 8.2 - HORIZONT products availability list 
TWS 8.3 - HORIZONT products availability list 

Following extracts from our documentation explain what has to be done in case of OPC or TWS upgrades:
XINFO
SmartJCL
TWS/Graph
TWS/Audit
TWS/BatchAD
TWS/BatchCP

Please note that you can download the necessary modules from our HOTFIX area