I noticed a mention of system variables in the wiki:
https://github.com/wiredrive/wtframework/wiki/Configuration-Management
but It wasn't really clear to me....
app: http://appium:12...@ciserver.local:8111/httpAuth/repository/download/IfhIOS_Tests/lastFinished/IFH.zip
or
app: http://appium:12...@ciserver.local:8111/httpAuth/repository/download/IfhIOS_Tests/lastSuccessful/IFH.zip