Decompress a file with code.

I can't add comment to your reply for whatever reason :/ Posting it as an answer also.

The asset can only decompress text so it won't work. Well, in the Unity Archiver on GitHub was broken script I think, couldn't fix it. In the Zip and Unzip also on GitHub. I couldn't figure out how to use it to be honest. The other errors are with GZipStream, like the name of this and this is wrong or something does not contain something, I added some namespaces but it was showing forever. Also my code for downloading is from a guy from Unity Forum. And by the way, I printed the progress of the download script and it was always -1. Here's the code:

 private byte[] downloadWithFTP(string ftpUrl, string savePath = "", string userName = "", string password = "")
 {
     FtpWebRequest request = (FtpWebRequest)WebRequest.Create(new Uri(ftpUrl));
     //request.Proxy = null;
 
     request.UsePassive = true;
     request.UseBinary = true;
     request.KeepAlive = true;
 
     //If username or password is NOT null then use Credential
     if (!string.IsNullOrEmpty(userName) && !string.IsNullOrEmpty(password))
     {
         request.Credentials = new NetworkCredential(userName, password);
     }
 
     request.Method = WebRequestMethods.Ftp.DownloadFile;
 
     //If savePath is NOT null, we want to save the file to path
     //If path is null, we just want to return the file as array
     if (!string.IsNullOrEmpty(savePath))
     {
         downloadAndSave(request.GetResponse(), savePath);
         return null;
     }
     else
     {
         return downloadAsbyteArray(request.GetResponse());
     }
 }
 
 byte[] downloadAsbyteArray(WebResponse request)
 {
     using (Stream input = request.GetResponseStream())
     {
         byte[] buffer = new byte[16 * 1024];
         using (MemoryStream ms = new MemoryStream())
         {
             int read;
             while (input.CanRead && (read = input.Read(buffer, 0, buffer.Length)) > 0)
             {
                 ms.Write(buffer, 0, read);
             }
             return ms.ToArray();
         }
     }
 }
 
 void downloadAndSave(WebResponse request, string savePath)
 {
     Stream reader = request.GetResponseStream();
 
     //Create Directory if it does not exist
     if (!Directory.Exists(Path.GetDirectoryName(savePath)))
     {
         Directory.CreateDirectory(Path.GetDirectoryName(savePath));
     }
 
     FileStream fileStream = new FileStream(savePath, FileMode.Create);
 
 
     int bytesRead = 0;
     byte[] buffer = new byte[2048];
 
     while (true)
     {
         bytesRead = reader.Read(buffer, 0, buffer.Length);
 
         if (bytesRead == 0)
             break;
 
         fileStream.Write(buffer, 0, bytesRead);
     }
     fileStream.Close();
 }

and this is how I use it:

 string path = Path.Combine(Application.persistentDataPath, "FTP Files");
 path = Path.Combine(path, "data.png");
 downloadWithFTP("ftp://yourUrl.com/yourFile", path, "UserName", "Password");

The original thread is here: https://stackoverflow.com/questions/43411525/download-files-via-ftp-on-android