maybe using compatibility mod on pc mite help with windows 8.1 

 Mine is brand new have not even used it and I am sending it back, if is this hard to update and you can't get support from Autel, it's junk. Better off buying a Snap On, at least you have quality and a good know product.
This is why it is so cheap, because it is junk.

 Downloaded file and when i try to install it says wrong file ?

 When you run Maxilink, you need to select the TPMS tab and then select TS401.  It is defaulted to a scanner when you start the program.  There is an updated version 2.42 on auteltech website that includes some 2014 models

 ^_^

Will this update work on windows 8.1? I have had an issue with updating as well. I do
not agree with a previous statement mentioned above as " this is junk .". The shop I
work at has Snap-on scanners and tpms tools. But everyne wants to use my ts401 or
my maxisys pro. Sorry Snap-on. Maxisys does way more and is a more complete
tool. I do wish there was better access to support as this is a very mauch complained
problem. I even talked my Dad in this tools (which owns a very prosperous mobile
diadnostic repair business and teaches diagnostics ) but has complained about the
support for the tool issues. All scanners have weak areas. I have used so many
different scanners ( including dealer )and found this aftermarket one the most
complete and close to! dealer operations.

I have been on the phone literally for hours on hold with no one ever picking up. I really
want to get this ts401 updated. Please help !!!!!!

 Please go to http://www.auteltech.com/UpdatesDownloads/429.jhtml# In TPMS part, you can see update pack of TS401.

You can update on windows 8.1. you have to disable the signature driver then install
the software supplied with the tpms download update pack and install. You can find
how to disable the signature driver by google search. Hope this helps. Did for me !