problem with installing the game (Metal Gear Solid)

I understand that probably no one comes to this forum anymore, maybe the game is old in '98, but I would like someone to advise how best to install the game, otherwise I have already tried many versions of the games and with all of them I have some kind of problems, now I've got it to the snowfield and there the game requires a second disc, although I have a PC version and one extra file, can someone tell me what to do /?