Install button isn’t highlighted

Hello there,

So I just bought myself a graphics tablet and it came with a free program (Autodesk Sketchbook 2010) and when I go through the installation process to install the program, I can’t click the “install button”. I’m using the right version of OSX (Yosemite 10.10.2). I’m using a 13 inch Macbook pro.

Does anyone know why I can’t click install?

Thanks in advance,

Sofia M.