Maybe do a try catch statement.

My-Logger "Install and configure App Volume Agent..."
$ConfigureAppVol = 'Write-Verbose -Message "Configuring App Volume Agent" -Verbose;
$AppVolAgent = "App Volumes Agent.msi";
$AppVolServer = "AppVol.tataoui.com";
$AppVolConfig = "/i ""D:\CustomFolder\VMware_AppVol\$AppVolAgent"" /qn REBOOT=ReallySuppress MANAGER_ADDR=$AppVolServer MANAGER_PORT=443";
Start-Process msiexec.exe -ArgumentList $AppVolConfig -PassThru -Wait'
try{
Invoke-VMScript -ScriptText $ConfigureAppVol -VM $strVMName -GuestCredential $DCLocalCredential
}
catch
{
Write-Host $error[0]
Sleep 10
Invoke-VMScript -ScriptText $ConfigureAppVol -VM $strVMName -GuestCredential $DCLocalCredential
}