Okay, one final push...Alright, thanks for all your advice.
I redownloaded everything from scratch. Finally got IF to run.
IF 1.80 does register the save10 file. When I load it, it goes back to the title screen, but the gallery seems to be unlocked. That's normal, right? It's untranslated as well, again, normal?
So now I'm a bit lost in what version is translated. When I run game.exe, it's translated, but it doesn't read any of the save games posted in this thread. Unless I missed a post that had English save games? Not gallery unlocks, actual mid-game save games.
So just use the v1.80, and the v1.80 save I shared. Nothing else. You will have 01-15 unlocked. Basically what you get is a scene and CG gallery.
There is NO actual game; just the scenes. I actually don't think you even have to load anything. Again, just get the v1.80 save.
You can switch the language in the options menu (guess I could/should have uploaded config.rpgsave in the archive as well - would have switched it to English) - the bottom main menu option. Then scroll down until you see *(Language)...
That said, seems Scenes 3-5 don't have a TL for some reason, but the others supposedly do.