Happy to help! When you install Local on macOS, it requires a kernel extension to fully support VirtualBox. Kernel extensions are easier to install in earlier versions of macOS (requiring only the admin pass), but High Sierra and newer are more restricted by default.
When you went to System Preferences, were you able to click “Allow” in the lower right-hand corner?
Try restarting your computer and installing Local one more time. Does it ask for kernel extension permission still?