There isn't a code for the installation. Useless

So I looked into it and: For installation you can just directly copy the game files to your HDD and the game will run as this unpatched version. But this is caused by a mistake in game's script. Normally it wouldn't run. Any game update fixes the oversight, so the game doesn't run anymore. Luckily comparing files makes it clear what mistake is, so it's easy to put it back in a new patch. So here we go, a new "crack" for the updated game: https://files.catbox.moe/ydfvog.zip Unpack and put patch3.xp3 in the game's folder after you install the update and the game will run again. Btw the only update you need is otome_changeview in 視点変更パッチ.rar It already includes both 修正パッチ Ver.1.01.1and 特製アペンドデータ

Alternative updated version, if the first one doesn't work. https://files.catbox.moe/slkhoh.zip This one removes explicitly makes the check return ok, including on non-Japanese Windows.