Вот так заработало, вопрос решен
$username = 'administrator'
$password = '
Ww123456'
$credentials = New-Object System.Management.Automation.PSCredential -ArgumentList @($username,(ConvertTo-SecureString -String $password -AsPlainText -Force))
Start-Process 'msiexec.exe' -ArgumentList '/I
C:\Users\alauser\Desktop\installer-tc-7\True7.msi /quiet' -WorkingDirectory C:\Windows\System32 -Credential ($credentials) -ErrorAction SilentlyContinue