Install was successeful should be Install was successeful
The string is not in 5.0 anymore.
FWIW: it should be: should be Install was successful in the description
fixed it on 4.3.3 here: https://github.com/lucidimagination/izpack/commit/eccf2443cb39015689f7cab227ebd90214c1a81b
The string is not in 5.0 anymore.