Backupper Standard 2.0 Scheduled Backup Requires Manual Username & Password Entry

My problem is similar to that
described by ISDPCMAN on May 5 and happens from both Windows 7 and
Window 8.1 laptop computers.  I made full backups from each laptop via
network shares to an external drive on a Windows 7 desktop computer. 
All three computers are members of the network Homegroup, which has Full
Control privileges (including Read and Write) to the shares.

The full backups worked normally to the respective shares, without needing manual entry of any credentials.  But scheduled backups, as well as incremental and differential backups run from the Backup drop-down tab on the Home screen, before running generate the "Input Username and Password" dialog shown here:

After credentials of an administrator on the desktop computer are entered, the scheduled backup runs.  But that requirement defeats the purpose of scheduling an unattended incremental or differential backup.  On the Windows 8.1 laptop, AOMEI does recognize specified path through the Home / Advanced / Properties screen.  But on the Windows 7 laptop, when the "Image Path" link is clicked on, Backupper displays the message shown here:

Under the previous AOMEI version (1.6), scheduled backups ran
successfully without any need for manual entry of credentials.  Giving
"Everyone" Full Control on the share permissions did not change the need
to enter credentials from either laptop computer.