@NNNontendo With the new MacOSX securities, it prevents starting programs from unknown developpers.
One thing you can do is download the latest version of Laces, and do
chmod +x ./Laces.app/Contents/MacOS/Laces
from the folder where you unzipped the archive.
Then you should be able to launch the app, get a message informing you that the developer hasn’t signed the app, and still open the app.