telethon

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from telethon import TelegramClient
import os
# Use your own values from my.telegram.org
api_id = os.getenv("api_id")
api_hash = os.getenv("api_hash")
bot_token = '802451454:AAHBXzDXaZD9tLKnptRT03FPvBzmSOjDc4I'
################################################
channel_username = 'stolenapps'
################################################

client = TelegramClient('session_name',
                    api_id,
                    api_hash)

assert client.connect()
if not client.is_user_authorized():
    client.send_code_request(bot_token)
    me = client.sign_in(bot_token)

# ---------------------------------------
msgs = client.get_messages(channel_username, limit=100)
for msg in msgs.data:
    if msg.media is not None:
        client.download_media(message=msg)