Titan Quest "please insert original disc instead of a backup" error

[agility77]

I tried mounting it with DT4 with securom loader v1.2 as it says to do at the txt help file of the release group, but I keep getting the error "please insert the original disc instead of a backup". I don't know what type of securom Titan Quest is protected with but it's probably the newest one as it's a new game. Please help.