I can't reproduce the problem on my (Windows) setup. What OS are you using? When in doubt I'd recommend trying the larger download version (~51 MB) that comes bundled with the JRE instead, it is more self-contained and less dependent on your particular environment.
Thanks for the quick reply! I'm using Mac OS X 10.14.6. When I double-click on legerd_mac.command (in the version bundled with GRE) I get this in the Terminal window:
/Users/mcweiner/Downloads/legerd1.1.0-cd-manifest/Legerdemain/legerd_mac.command ; exit;
MacBook-Air:~ mcweiner$ /Users/mcweiner/Downloads/legerd1.1.0-cd-manifest/Legerdemain/legerd_mac.command ; exit;
Error: Could not find or load main class legerd.TheApp
Caused by: java.lang.ClassNotFoundException: legerd.TheApp
It's also possible that I might be able to use Wine to run the .bat file, if I can work that out.
Cheers again!