I found a solution. In the folder C: \ Users \ Username \ Documents \ Froom \ EFASS \ Database \ customnetworks, create a VATSIM.ini file with the following content:
[NETWORK]
NAME=VATSIM My file
DATAURL=http://info2.vroute.net/vatsim-data.txt
FORMAT=VATSIM
METARURL=http://wx.ivao.aero/metar.php
TAFURL=http://wx.ivao.aero/taf.php

P.S.
1) the file must be with the ini extension
2) in the program settings select the name "Vatsim My file", and all good luck and pleasant flights!

Yes, and sorry for my English, I'm from Russia and translated using an online translator)