From the best of my memory
You need to first install the Max Link 2 software on a windows PC.
You need to have your TS 401 charged up preferably overnight with the provided AC adapter.
With a Virus and malware free Windows PC with a good high speed internet connection , go to the web page and download the latest TS 401 update, (This is the web link I see in USA) and unzip and save it to a folder on your desktop so you can find it.
http://www.auteltech.com/TPMS%20Diagnostic%20&%20Service%20Tool/403.jhtml
Open up the Max Link 2 program , select TPMS, select TS401.
Turn on your TS401 and set to update mode and attach TS401 to the pc with provided USB cable.
On Max Link 2 Program , Select update program , Browse , find and select either the European Union( or the USA folder) NOT BOTH, extract.
Note After that completes , On the Max Link 2 also select update DTC.