The newer WA Agent Release number will not show in Topology of older DE and Desktop Client versions.
New WA Agent version was released after DE version
Release : ANY
Component : Workload Automation DE (ESP dSeries)
If you are on DE 12.2 or below, pick any WA Agent Release number in Topology. Choose the highest possible, e.g. 11.4 for 11.5 for R12 Agent version.
Note: In DE version 12.3 and above, you must 12.0 for WA Agent 12.