Going to move this to the Off-Topic Discussion Board.
This isn't a Feral-Heart related help situation.
But yes, do check out that link.
When purchasing SAI, all you're paying for are a few brushes, colours and a canvas. However, with the one I have provided in the thread made in the link first posted, there are more brushes and more things to use within that download.
It's more reliable and does not cause issues at all. There's no need to spend all that money on something you can have for free.