The dnsupdate package name has changed from quest-dnsupdate between QAS 4.1 and 4.2 which causes some problems with the update script.
If the install.sh script is run without any options, then the old quest-dnsupdate package from QAS 4.1 is left while the rest of QAS is update to 4.2.
If the dnsupdate package name is specified in the install.sh command then the dnsupdate upgrade will fail due to a conflict with the quest-dnsupdate package.
The old quest-dnsupdate package can be uninstalled and then the new dnsupdate package can be installed.
Defect #798241 has been fixed in Authentication Services 4.2.2.
Upgrade to QAS 4.2.2 or higher. To download go to Download Latest QAS version