Try like this
$cluster = Get-Cluster 'CL-DEV-NP'
$spec = New-Object VMware.Vim.VirtualMachineConfigSpec
$spec.Tools = New-Object VMware.Vim.ToolsConfigInfo
$spec.Tools.ToolsUpgradePolicy = "manual"
$filter = @{'Config.Tools.ToolsUpgradePolicy' = 'upgradeAtPowerCycle'}
Get-View -ViewType VirtualMachine -SearchRoot $cluster.ExtensionData.MoRef -Filter $filter | %{
$_.ReconfigVM($spec)
}
Blog: lucd.info Twitter: @LucD22 Co-author PowerCLI Reference