I downloaded the Mac version. However, there is no reaction when I clicked "Add Files..." or "Add Folder..." button. The cursor of "Export Path" is visible but I cannot type anything into the bar. Moreover, the font and the window are small. There is no way to adjust the font size nor the window size.
Edit: I borrowed a Windows device to test if this product can reduce the number of tris as it suggested. Turns out that it does its job. However, the MagicaVoxel texture does not work on the reduced version. Since this product is designed for MagicaVoxel, I had expectation that the texture should work on the reduce one as well.