If you want the same "clunky retro feel" as PicoCAD, Trenchbroom is a Quake level editor. It shares the same manual vertex-snapping workflow.
Instead of seeking a cracked version, consider the following alternatives: picocad crack free
When you use a version (i.e., a pirated copy), you are telling the developer that their time is worth nothing. In the indie world, that leads to abandoned projects. If you want PicoCAD 2.0 to exist, pay the $4. If you want the same "clunky retro feel"