Note: On macOS 11 Big Sur, if the "Allow" button is unavailable or does not load the UAD driver when clicked (causing red “Driver Not Installed Correctly” text to appear in the UAD Meter app window), you might need the UAD Big Sur Patch. Visit the Driver Not Installed Correctly on macOS Big Sur article to get the patch installer.
To improve macOS security, Apple requires that new drivers must be explicitly allowed to load in the Security & Privacy pane within macOS System Preferences. If new UAD software is installed and the UAD drivers are not allowed, the UAD Meter will display "Driver Not Installed Correctly" or “Driver Not Allowed” in red text.
Allow UAD software in macOS System Preferences
For detailed instructions on how to allow UAD software on Mac, see the specific compatibility article for your version of macOS:
"Driver Not Installed Correctly" or “Driver Version Mismatch” on other operating systems
On all other operating systems, "Driver Not Installed Correctly" or "Driver Version Mismatch" typically means that there was an issue with the installation of one or more UAD drivers. This issue can usually be resolved by doing a complete uninstall/reinstall of the UAD software, including manually deleting the UAD preference files (as well as the UAD drivers on Windows). For instructions, visit the article for your operating system below.
UAD Uninstall/Reinstall Instructions