@RogueFactor, the entire source code is available with the plugin and you can modify and recompile it as you wish on any platform. The plugin (including source) will be placed once installed from the launcher (Epic Games\4.13\Engine\Plugins\Marketplace\DungeonArchitect).
If you plan on purchasing it, then please buy it from the marketplace (and not my website) and drop me an email (.akbar@coderespawn.com). Since you have trouble with the launcher, I’ll grant you access to my website where you can download it directly