here you go. :)
My computer is prone to catching shit, and I didn’t have any trouble when I downloaded it, so I do recommend it. It was a described to me as a cross between sai and photoshop, and I’ve really enjoyed it so far.
But if you’re still not sure about firealpaca, I’d also recommend GIMP. I’ve been using it for a year and a half, and it’s pretty nice and basically does any and everything you’d need out of a drawing program. It, like firealpaca, is also free.