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public class GZipDecoder : MonoBehaviour {

    // The URL of the gzip-encoded image file
    private string imageUrl = "https://example.com/image.gz";

    IEnumerator Start() {
        // Create a UnityWebRequest to download the gzip-encoded image file
        UnityWebRequest request = UnityWebRequest.Get(imageUrl);

        // Send the request and wait for the response
        yield return request.SendWebRequest();

        // Check for errors
        if(request.result == UnityWebRequest.Result.ConnectionError || request.result == UnityWebRequest.Result.ProtocolError) {
            Debug.LogError(request.error);
            yield break;
        }

        // Get the gzip-encoded image data from the response
        byte[] gzipData = request.downloadHandler.data;

        // Create a MemoryStream to hold the decompressed image data
        MemoryStream memStream = new MemoryStream();

        // Create a GZipStream to decompress the gzip-encoded image data
        GZipStream gzipStream = new GZipStream(new MemoryStream(gzipData), CompressionMode.Decompress);

        // Copy the decompressed image data to the MemoryStream
        gzipStream.CopyTo(memStream);

        // Get the decompressed image data as a byte array
        byte[] imageData = memStream.ToArray();

        // Create a Texture2D from the decompressed image data
        Texture2D texture = new Texture2D(1, 1);
        texture.LoadImage(imageData);

        // Use the Texture2D in your application
        // ...
    }
}