These are unofficial. You generally need a legitimate copy of the base game (or the DX/Libido version) to apply them legally.
If you are looking to enhance your experience, applying a community patch is essential. These patches unlock restricted content, add fan-made English translations, and include thousands of mods for character customization. The Most Popular: HF Patch honey select 2 patch
It allows you to load high-quality character cards and scenes created by the community that would otherwise be incompatible with the "vanilla" game. These are unofficial