That doesn't even make sense.
How many units previous FF sold in PC releasing at late date?
According to Steamspy, which used to be capable of giving more precise data but is not able to anymore:
Please note that this only includes Steam and not Epic purchases or in the case of FFXIV and FFXI, external launchers.
Final Fantasy - 500,000 - 1,000,000
Final Fantasy II - 200,000 - 500,000
Final Fantasy III - 200,000 - 500,000
Final Fantasy III (3D) - 500,000 - 1,000,000
Final Fantasy IV - 100,000 - 200,000
Final Fantasy IV (3D) - 200,000 - 500,000
Final Fantasy IV: The After Years - 50,000 - 100,000
Final Fantasy V - 200,000 - 500,000
Final Fantasy VI - 200,000 - 500,000
Final Fantasy VII - 1,000,000 - 2,000,000
Final Fantasy VII Remake - 500,000 - 1,000,000
Final Fantasy VIII - 500,000 - 1,000,000
Final Fantasy VIII Remastered - 500,000 - 1,000,000
Final Fantasy IX - 500,000 - 1,000,000
Final Fantasy X/X-2 - 500,000 - 1,000,000
Final Fantasy XI - 0 - 20,000
Final Fantasy XII - 1,000,000 - 2,000,000
Final Fantasy XIII - 1,000,000 - 2,000,000
Final Fantasy XIII-2 - 200,000 - 500,000
Lightning Returns: Final Fantasy XIII - 200,000 - 500,000
Final Fantasy XIV - 2,000,000 - 5,000,000
Final Fantasy XV - 1,000,000 - 2,000,000
Final Fantasy Type-0 - 200,000 - 500,000
World of Final Fantasy - 100,000 - 200,000
Crisis Core: Final Fantasy VII - 200,000 - 500,000
Final Fantasy Dissidia NT - 500,000 - 1,000,000