I use a silent installer to make everyone the same, but have never seen this issue you speak of. Have used this style of installer for some time over various versions. With in my batch the installer line uses the -ident switch and it works fine. This is what this line looks like for me...
Agreed, when the MS patch KB3061518 is applied to a Catia client machine, it loses connectivity to the DSLS license server. Once we updated the DSLS license server to version V6R2015x.FP.CFA.1517, this issue went away.