...
v4.0 uses a native macOS Mojave User Interface, which means, that just:in considers the macOS General Settings, like Appearance (Light Mode, Dark Mode) or Accent colour. It is also possible to force either the Light or the Dark Mode within the application settings. Furthermore v4.0 comes with a completely redesigned Channel Viewer Area and the new version also brings more flexibility for the Channel Viewer Configuration. The Channel Connection Process got also a complete redesign and was moved into the Inspector, where we also introduce Tabs in v4.0. Lastly the whole configuration of the engine and channels were moved into the User Interface, which means, that all engines and channels can be configured on a single machine.
...
64-Bit-Architecture
Both applications (User Interface and Engine) are running with a 64bit architecture 64-Bit-Architecture now and are future-proofed for upcoming macOS releases.
...