FYI, it’s getpaint.net if you wanna actually get it 
That’s my goto bitmap program, with Inkscape as my vector.
@justinbigby
Generally the all-black happens because all those outer circles fill in - so all the stuff is there, but it’s overlayed by the outer circle so you can’t see any of it. If you read the entire thread where the first one of these was originally posted you’ll find a lot of people discussing the difficulty of engraving it.
This is a .pdf that will walk you through the tools you’d need to make this engravable.