The installer runs through until the summary, then it gives a generic failure screen. At the top it says "an error occurred during installation." Below that it says: The installation failed. The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance."
I'll mention that, though Mojave is causing quite a few software package installation failures due to a lack of permissions, usually the problem is noted in the System Preferences - Security & Privacy - General pane, where a message saying "“System software from developer [XXXX] was blocked from loading” and an "Allow" button to grant permissions appear, that did not happen with the Obxd failed installation (i.e. -- nothing about the failed installation shows up in the System Preferences - Security & Privacy - General pane).
This is all just FYI, in case it is an issue that extends beyond my computer.