Powershell to decompress DEFLATE data

decompress.ps1

$base64data = "insert compressed and base64 data here"
$data = [System.Convert]::FromBase64String($base64data)
$ms = New-Object System.IO.MemoryStream
$ms.Write($data, 0, $data.Length)
$ms.Seek(0,0) | Out-Null

$sr = New-Object System.IO.StreamReader(New-Object System.IO.Compression.DeflateStream($ms, [System.IO.Compression.CompressionMode]::Decompress))

while ($line = $sr.ReadLine()) {  
    $line
}

also, if you are trying to decompress things compressed by zlib, you probably want to use ZLibStream instead of DeflateStream. Now, if you're trying to decompress an actual ZipFile, the process is different, those are for bare streams.

Thank you @Luiz-Monad, this helped me a lot and works now.
Have a great day!