Can't update the game

Can anyone help me update the game? I’ve tried installing the patches but I can’t get them to work, I’ve also tried to find lstchk.ini so that I can delete it, but it’s not there. I bought it from GOG awhile ago but can’t access my account anymore, so I can’t get the update from them.

Does anyone have any other ideas that could work for me?

Thanks for any help you can give me.