Install windows update - powershell

Question

I have following powershell script which should update my windows OS everytime I run it. Therefore I use the given windows API in order to search, download and install the updates. But somehow only searching for them actually works.
This is my script:
$global:scriptpath = $MyInvocation.MyCommand.Path
$global:dir = Split-Path $scriptpath
$global:logfile = "$dir\updatelog.txt"
write-host " Searching for updates..."
$session = New-Object -ComObject Microsoft.Update.Session
$searcher = $session.CreateUpdateSearcher()
$result = $searcher.Search("IsInstalled=0 and Type='Software' and IsHidden=0")
if ($result.Updates.Count -eq 0) {
Write-Host "No updates to install"
} else {
$result.Updates | Select Title
}
$downloads = New-Object -ComObject Microsoft.Update.UpdateColl
foreach ($update in $result){
try {
$update.AcceptEula()
$Null = $downloads.Add($update)
} catch {}
}
$count = $result.Updates.Count
write-host ""
write-host "There are $($count) updates available."
write-host ""
read-host "Press Enter to download\install updates"
$downloader = $session.CreateUpdateDownLoader()
$downloader.Updates = $downloads
$downloader.Download()
$installs = New-Object -ComObject Microsoft.Update.UpdateColl
foreach ($update in $result.Updates){
if ($update.IsDownloaded){
$installs.Add($update)
}
}
$installer = $session.CreateUpdateInstaller()
$installer.Updates = $installs
$installresult = $installer.Install()
$installresult
But I get following error:
Exception calling "Download" with "0" argument(s): "Exception from HRESULT: 0x80240024"
+ $downloader.Download()
+ ~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [], MethodInvocationException
+ FullyQualifiedErrorId : ComMethodTargetInvocation
Somehow this line: $downloader.Updates = $downloads is not executed, but I don't know why. I also already tried running the script as an admin, didn't work either.

Answer 1

That error code is the WU_E_NO_UPDATE, described here. Basically it says that the Updates collection is not set or empty.