If you are experiencing an issue with Parblo pen or mouse pointer while upgrading to the operating macOS Mojave 10.14.1 or above versions, then add the driver files to the whitelist as per the following instructions.
Models: A640 Mast10
1. Go to System Preferences > Security & Privacy and select the Privacy tab. You'll see an option for “Allow apps below to control your computer”.
2. Check the box -"YJDaemon"
3. Click the icon labeled "Click the lock" in the lower left corner to allow changes.