ok, if you already have a list of wksta's, you can use directly at.
shell "at \\$wksta\setup.exe 17:50"

?
the list is already in the ini-file like I explained earlier.
if you need to use it for this, you could make the ini more complex.
for every installed software do own value with 1 if installed already and 0 if not.

this way it's easy to control those all.
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