I assume by legal copy you mean non-pirated. Well as far as I know, I bought my copy of the game and the LCPDFR installer also says I have a legit copy of the game. So I got that down. I'm gonna try the tips you recommended.
I installed LCPDFR to GTA:EFLC and loaded up TBoGT and it crashed with this message appearing.
Naturally, I tried downgrading EFLC to 1.1.2.0, and the same message still appeared. Thanks to anyone willing to help me out in advance.
PS: I'M RUNNING WINDOWS 8!