There are two ways to install the add-on: via Blender's extensions or manually. Let's take a look at each option. The add-on has two settings here: a color mask and a reset colors button. RGB random ...
Note that it can not convert non-official DXGI formats (e.g. ASTC_4x4) from and to non-dds files. It means you can not use .tga, .hdr, .bmp, .png, and .jpg for them.