Latest release: 4.1.0
Follow the steps in INSTALL.md to install the release copy of Polished Map, or the longer instructions to build it yourself from source.
The example/ directory contains a minimal pokecrystal project with two test maps. Kanto.180x135.kanto.blk is a stitch of every Kanto overworld map (they all use the "kanto" tileset). Johto.235x135.johto.blk is a stitch of every Johto overworld map; Goldenrod and Azalea use the johto_modern tileset, so try switching tilesets with Edit→Change Tileset… or by pressing Ctrl+H.
More information is at the Skeetendo Forums. If you have questions or comments, please go there.