PowerShell Install .exe application with Credentials stored in Clixml - powershell

Question

Trying to create a Powershell script that installs an application (.exe) with stored credentials (Clixml).
Everything works fine when using:
Start-Process -FilePath "C:\Users\$($env:USERNAME)\Downloads\Software\Software.exe" -ArgumentList '/s' -Credential $credentials
But I would like a more elegant solution:
$startprocessParams = #{
FilePath = "C:\Users\$($env:USERNAME)\Downloads\Software\Software.exe"
ArgumentList = '/s'
Credential = $credentials
Verb = 'RunAs'
PassThru = $true
Wait = $true
}
$proc = Start-Process #startprocessParams
if ($proc.ExitCode -eq 0) {
'Software installed!'
}
else {
"Fail! Exit code: $($Proc.ExitCode)"
}
This works perfectly without the Credential parameter, you then get the "enter credentials/UAC" popup that I would like to avoid. With the Credential parameter I get this error:
Start-Process : Parameter set cannot be resolved using the specified name parameters.
What am I missing here? Appreciate any advice and/or guidance.
EDIT:
I use the following line to import the credentials:
$credentials = Import-Clixml "C:\Users\$Env:USERNAME\AppData\Local\Apps\SOFTWARE\cred.xml"
The credentials is created with a standard:
Get-Credential | Export-Clixml "C:\Users\$Env:USERNAME\AppData\Local\Apps\SOFTWARE\cred.xml"
This works as it should.

Answer 1

you need to set the credentials as PSCredential.
have a look at this solution:
$username = "username"
$password = "password"
$credentials = New-Object System.Management.Automation.PSCredential -ArgumentList #($username,(ConvertTo-SecureString -String $password -AsPlainText -Force))
Start-Process dnscrypt-proxy.exe -WorkingDirectory path_here -Credential ($credentials)
is it stored in PSCredential in the first place?

Answer 2

Start-Process : Parameter set cannot be resolved using the specified name parameters.
The error tells us the set of parameters used is incorrect. Checking the MSDN doc or Get-Help for Start-Process will show that -Credential can not be used with -Verb.