Here's what worked for me on getting it to work under Mojave.
1. If you've installed Universal Controller, uninstall it.
2. Restart
3. Restart again but this time:
a. Boot to Recovery OS by restarting your machine and holding down the Command and R keys at startup.
b. Launch Terminal from the Utilities menu.
c. Enter the following command:
csrutil disable
4. Restart
5. Reinstall Universal Controller (once installed, the driver should read the correct revision # and all should work correctly)
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Thoughts: It seems like Apple's System Integrity Protection feature is interfering with the KEXT (Kernal Extension/s) that are needed for the drivers to be installed and function correctly. As such, this feature has to be disabled by the above steps to allow for proper installation.
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Once installed you can always re-enable System Integrity Protection by doing the following:
a. Boot to Recovery OS by restarting your machine and holding down the Command and R keys at startup.
b. Launch Terminal from the Utilities menu.
c. Enter the following command:
csrutil enable