I've downloaded the enhanced version of the original game, as I've noted I'll do in the previous post. I've installed TLD on top of it, tested it, it worked properly, so I've decided to move permanently to the enhanced version. (Already done.) A pity I only heard about the whole thing yesterday. For an official release, it's so obscure that I had never heard of it up until I noticed the TLD manual making references to said enhanced version.
Unfortunately, I had to part with all my saves and decided it's not worth exporting my characters either. So I'll be starting completely anew in other mods as well, just to be sure I don't have any technical issues between the two different version of the original game.