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If your account does not have a password, “net use” won’t work, unless you enable password-less login from stuff other than the console in Group Policy on the host system at “Computer Configuration - Windows Settings - Security Settings - Local Policies - Security Options - Accounts: Limit local account use of blank password to console logon only”. Set that to Disabled. DISM will take some time. In the end, you will get an “install.wim” file.