Jabber installer is distributed as MSI. You could try the below.
"For MSI installers there is a perfect debugging tool named ORCA (One Really Cool Application). It is part of Microsoft PLatform SDK (or Windows SDK). The tool can export all tables stored inside MSI database. Every table in MSI is basically a list of instructions describing the intended change on target machine."
Link: https://superuser.com/questions/457860/how-can-i-find-out-what-modifications-a-program-s-installer-makes
There are other applications mentioned in the forum that you could try as well. Good luck!
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