Download of ProPaint 3.7 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. ProPaint for Mac lies within Design & Photo Tools, more precisely Viewers & Editors. This Mac app is an intellectual property of EffectMatrix Ltd.
From the developer:
Paint for Mac Pro version is the realistic digital art program that is used to edit image, vector graphic design, free-form transformation, add filters, crop, alpha channel edit and more to paint on Mac.
Paint for Mac Pro provides high quality image manipulation tools for original artwork creation on Mac.
You may want to check out more software for Mac, such as Pro Paint for Mac or Pro Paint, which might be similar to ProPaint.