"Check Service Level" is dead. The best you can hope for it is it telling
you that there's a newer level. It can no longer install it. You have to
use "run as administrator" to actually install something.
IBM's Lotus Notes has a "Smart upgrade, run as" (aka SURUNAS) function
that can figure this all out for upgrading Notes clients but the team at
IBM i Access for Windows has just given up and are pushing the Java client
as an alternative.
I can't say much more without falling into a swamp of negativity.