make pen pressure on paint tool sai on a macbook

I will state exactly what I want, which is SAI's provided brushes (watercolour, marker, etc) with pen pressure and its download links for Photoshop. So yeah don't get me started on it (I will rant if you try to insult my Macbook, SAI, or Photoshop) and I understand the situation here alright. I would love to use SAI normally but ya know, pen pressure doesn't work. I will state exactly what I want, which is.

Paint Tool Sai With Pen Pressure Download.

Paint Tool Sai Mac Download With Pen Pressure.It features fully digitizer support with pressure, amazing anti-aliased drawings, highly accurate composition with 16bit ARGB channels, simple but powerful user interface, easy to learn, fully support Intel MMX Technology, and data protection function to avoid abnormal termination such as bugs. From PaintTool SAI is high quality and lightweight painting software, fully digitizer support, amazing anti-aliased paintings, provide easy and stable operation, this software make digital art more enjoyable and comfortable.

Make pen pressure on paint tool sai on a macbook