Trouble with using powershell to install a small application

When trying to install an application with powershell, it doesn't.
Here is the  script I run, the files copy over just fine, but it does not actually install.

$computerName = Read-Host "Enter your VM name"
Copy-Item -Path \\servername\c$\AgentInstalls\FireEye\xagtSetup_26.21.8_universal.msi -Destination "\\$computername\c$\windows\temp\xagtSetup_26.21.8_universal.msi"
Copy-Item -Path "\\servername\e$\AgentInstalls\FireEye\agent_config.json" -Destination "\\$computername\c$\windows\temp\agent_config.json"
Invoke-Command -ComputerName $computerName -ScriptBlock {
    c:\windows\temp\xagtSetup_26.21.8_universal.msi /silent
}

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