As the title suggests, C++ 2015 isn't installing at all. I'm running Windows 7 Ultimate. Every time I run the install it just gives me an error saying an unspecified error. Error number is 0x80240017. I've searched up the error for a good few days and have yet to find a clue on how to fix it properly. People have suggested that I get the KB299226 update for the Windows but that isn't even installing on my computer and that's something that is needed in order to install C++ 2015. And whenever I try to go through the Ashita launcher, if it doesn't give me the error saying that I'm missing C++ 2015, it gives me an error saying it failed to inject into PlayOnline. Does anyone know how to fix this? I really want to be able to play and it's been almost a whole week.

I don't know if this'll help at all but these are all the things I installed on a 7 machine to get myself up and running:
https://www.dropbox.com/sh/u97no63v2eig ... bfnka?dl=0

If you don't trust there, you can find the versions on official websites with the files names here at least. At one point I think I even started with the 2008 distribution files(x86 and 64) and just installed as many of them from 2008 to 2015. For some reason installing/patching over has some coding left over that doesn't get installed in newer versions. But it's weird that 2015 won't install at all.

Do you have at least SP1 installed for Windows 7?