I have downloaded http://188.8.131.52/u18/U18_V_define.zip
and put it here in case anyone needs it:
I gave instructions a little while back here how someone could bring up their own private wifi network with 184.108.40.206 as the address of a web server and place all of the files there.
Hopefully the USMART app would be fooled into loading the local copy, and not time out like it does with the mfr's crappy server.
Anyone willing to try it?