The Door Randomizer is hosted at https://archive.codeplex.com/?p=smdoor
The "Archive Download" at the Door Rando website contains only the source code at first glance, but the executables needed to randomize a rom are hidden within. The releases folder contains a couple more folders and a JSON file. The JSON file can be opened with any text editor and will reveal the hidden secrets.
Inside the two folders you'll find a file with a random name. These files are .rar archives in disguise. Rename the file so that it ends in ".rar" and extract it to find the executables. Version 0.1 (stable) is in the 0 folder. Version 0.3a (beta) is in the 1 folder.