Click this link and download the 2.61 zip file and save it to your computer. (hopefully your PC has a program that can open zip files)
If I remember correctly, Make sure you have Max Link 2 program already installed on your PC. That program in default mode looks for scan tools not a TPMS tool. Select TPMS and the proper tool (TS401 )from the list of TPMS tools. Plug the USB adapter from the TS401 into the PC and the Max Link 2 program should show TS401 device as connected.Select update on the TS401 tool. Browse and find the 2.61zip file you downloaded and saved to a location on your PC . Unzip the file and double click on the correct one that pertains to your geographic location US or EU and it should update. Good Luck