The windows support software is not available?

I've been trying to download a pressure sensitive Paint Tool SAI on my macbook for at least a year now, and apparently in order to do this, I need to install some software that allows windows to run on it.

First I tried windows parallels.
I can't remember exactly what it said, but it was something about how there was an error, and it couldn't run properly.
So I tried again and again, and got the same result.

Then I tried my most recent installer, bootcamp, and the boot camp assistant brought me through the steps, everything was going well, until the actual download started. The one downloading the windows support. It stopped after a while and a message popped up saying 'The windows support software is not available.'

What does this mean?

I have dropped my laptop a few times, and the first time I did, blackness overtook my screen, and I had internally broken the screen. I got it repaired for $400.

Then a virus of some sort overtook my computer, freezing it. I got it fixed. Another $300.

Then something happened to the screen, which made it go black. You just needed to move the top around a bit to get rid of it, but it became annoying so we got it fixed. This time it was fixed for free by a family member.

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Could any of these breaks be the problem? We paid $700 to get them fixed, so they should not be a problem in my opinion!
Could I get some help?