Please note that you will only be able to scan those computers you can access with the privileges you have provided. If you use the Basic Edition or the Professional Edition, the account you have logged-on needs these rights. If you are using the Enterprise Edition, the service user account you have provided during the setup needs to have these rights. The service user account is supplied to the services “LaniScanEngine service” and “LaniBackupServices”. With the Enterprise Edition, the LaniScanEngine service collects the data by connecting to the devices. You can change this user account, if you need to, by changing the log-on properties of the service in the computer management console.
You will find more information about the installation procedure here: 4.2 Installation Procedure.
Please note that scanning will work without any problems in domains if you have the proper access rights. In workgroups, using Windows 8/8.1/10, you need to activate admin access rights via a little registry hack. If you got the proper rights, the hack will be applied automatically. The first scan will propably fail, but after a reboot or on the next scan, it will work as well: