Use the below script to install Qualys.

Evaluation Code:

if (Test-Path -Path "C:\Program Files\Qualys\QualysAgent") 
    {
        exit 0
    } 
    else 
    { 
        exit 1 
    }

Remediation Code:

.\QualysCloudAgent.exe CustomerId="{INSERT}" ActivationId="{INSERT}" WebServiceUri="INSERT"

Note: Leave {} inside the quotes for both CustomerId and ActivationId