I have umask 027 set in my profiles. Installing SlickEdit using this umask, yields a non-functional SlickEdit for all users of my PC except for root (from which I rarely start SlickEdit).
Adjusting umask to 022 prior to SlickEdit installation solves this.
If you can temporarily adjust the umask setting during installation, it would solve this problem. Alternatively you could check the umask setting and warn/question the user if the umask value is not fit for installing SlickEdit.