Seems you are right: I have tried to install DipTrace on fresh system. I did not get any alert, but the installer changed settings of My Documents (not all user folders though) and added all permissions for all users item (not network sharing though). This is actually installer and not DipTrace software itself as I didn't run it at all - I will check installer settings how to change that.
Added later:
Contacted Pantaray (developer of QInstall) regarding the issue.
Regards,
Stanislav Ruev
DipTrace Team