@BasicallyACat
A 1). No.
A 2). I don't use a Mac, sorry! However - I've seen other posts that say "it's not working", (and here I'm assuming 'not downloadable'), but I've tried it each time, and had no issues and did download it again on reading your post. I will share this on my OneDrive if you wish - just pm me or post a reply here.
KG still works and produces good, perfectly usable and configurable maps with A20, but can/will only create the 'old-style' road system, as mentioned by Brad earlier in this thread. The towns, cities, poi's, the biome.png and heightmaps - all can be changed as you wish, and work perfectly.
A better solution (IMO!) - you might want to check out Brad's 'Map Toolz' video, as it will give you a good insight as to what is possible now, using the new - and much improved RWG system. Brad now has three 'how-to' videos on 'Toolz' - his site for all his videos is
here. - look for 14, 15 and 16.
In addition - I followed his advice and added 'MageDaddy's' Improved RWG mod - which adds about fifty lines to the rwgmixer.xml - altering the zoning numbers which makes for better town/city/Old West/commercial/downtown/etc., layouts. This is just a single xml in his folder which can be dropped into your 'Mods' folder, or the xml just added to your own mod.
Here.
Secondly - after the map had been produced - I used MGMP's Map Previewer mod to give a good preview, showing the Trader locations by name, plus the Start Points.
Here..
This is not any more difficult than using KingGen - it's just different, but it will give you a map where you can control that ugly biome, or fix a heightmap to how you like it to be, and add a number of other improvements while being fully compatible with the already-good A20 RWG system.
Sorry for being long-winded - I just hope this helps!