Downloading jdk using powershell

On inspecting the session on oracle site the following cookie catches attention: oraclelicense=accept-securebackup-cookie. With that in mind you can run the following code:

$source = "http://download.oracle.com/otn-pub/java/jdk/8u5-b13/jdk-8u5-windows-i586.exe"
$destination = "C:\Download\Java\jdk-7u60-windows-i586.exe"
$client = new-object System.Net.WebClient 
$cookie = "oraclelicense=accept-securebackup-cookie"
$client.Headers.Add([System.Net.HttpRequestHeader]::Cookie, $cookie) 
$client.downloadFile($source, $destination)

EDIT: here's the reason for your problem: you can't directly download the file without accepting the terms before.

I'm using the following script to download files. It's working with HTTP as well as with FTP. It might be a little overkill for your task because it also shows the download progress but you can trim it untill it fits your needs.

param(
    [Parameter(Mandatory=$true)]
    [String] $url,
    [Parameter(Mandatory=$false)]
    [String] $localFile = (Join-Path $pwd.Path $url.SubString($url.LastIndexOf('/'))) 
)

begin {
    $client = New-Object System.Net.WebClient
    $Global:downloadComplete = $false

    $eventDataComplete = Register-ObjectEvent $client DownloadFileCompleted `
        -SourceIdentifier WebClient.DownloadFileComplete `
        -Action {$Global:downloadComplete = $true}
    $eventDataProgress = Register-ObjectEvent $client DownloadProgressChanged `
        -SourceIdentifier WebClient.DownloadProgressChanged `
        -Action { $Global:DPCEventArgs = $EventArgs }    
}

process {
    Write-Progress -Activity 'Downloading file' -Status $url
    $client.DownloadFileAsync($url, $localFile)

    while (!($Global:downloadComplete)) {                
        $pc = $Global:DPCEventArgs.ProgressPercentage
        if ($pc -ne $null) {
            Write-Progress -Activity 'Downloading file' -Status $url -PercentComplete $pc
        }
    }

    Write-Progress -Activity 'Downloading file' -Status $url -Complete
}

end {
    Unregister-Event -SourceIdentifier WebClient.DownloadProgressChanged
    Unregister-Event -SourceIdentifier WebClient.DownloadFileComplete
    $client.Dispose()
    $Global:downloadComplete = $null
    $Global:DPCEventArgs = $null
    Remove-Variable client
    Remove-Variable eventDataComplete
    Remove-Variable eventDataProgress
    [GC]::Collect()    
}