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Here are the steps to transfer an APK file from a server to external storage using Xamarin Forms:

1. Add the WRITE_EXTERNAL_STORAGE permission to the AndroidManifest.xml file in your Android project.

2. Use the WebClient class to download the APK file from the server. Here is an example:

   string url = "http://example.com/myapp.apk";
   string outputFile = Android.OS.Environment.ExternalStorageDirectory + "/myapp.apk";
   
   WebClient client = new WebClient();
   client.DownloadFile(url, outputFile);
   

   In this example, the URL of the APK file is http://example.com/myapp.apk and the output file is stored in external storage using the path Android.OS.Environment.ExternalStorageDirectory + "/myapp.apk".

3. Make sure to handle any exceptions that may be thrown during the download process.

   try
   {
      // Download the APK file
      WebClient client = new WebClient();
      client.DownloadFile(url, outputFile);
   }
   catch (WebException ex)
   {
      // Handle any exceptions that may be thrown during the download process
   }
   

4. Once the APK file has been downloaded, the user can manually install it by opening the file from the Downloads folder in the device's file manager. Alternatively, you can programmatically install the APK file by launching an intent to the package installer. Here is an example:

   Intent intent = new Intent(Intent.ActionView);
   intent.SetDataAndType(Android.Net.Uri.FromFile(new Java.IO.File(outputFile)), "application/vnd.android.package-archive");
   intent.SetFlags(ActivityFlags.NewTask);
   Android.App.Application.Context.StartActivity(intent);
   

   This code launches an intent to the package installer that prompts the user to install the downloaded APK file.

Note: It's important to note that installing apps from unknown sources (i.e. outside the Google Play Store) is a security risk and should be done with caution. You should inform the user of the potential risks involved in installing an APK file from an unknown source.