The phrase "Download SMARTGO IPTV txt" could refer to a few different things, depending on what you're trying to accomplish. To make sure I provide the right information, could you clarify if you are looking for:
Specifically, M3U or TXT playlists used to load channel lists into the SmartGo IPTV player.
Instructions on how to download and set up the SmartGo IPTV application on various devices.