Ah, that version is for old, old versions of Minecraft: the Alpha versions. It's specifically designed for Alpha 1.2.6 but should work with earlier versions. It's just the current textures made into the old-style texture pack formats that the old versions used.
Not that version (it only has a few textures because Alpha only had a few blocks), but yurisuika is keeping the full version of Isabella II updated over here. You can track the development on the SuikaCraft Discord.