Background

Apple has adopted new security features on Apple silicon-based Macs.
To install the Yamaha Steinberg USB Driver or the Yamaha Steinberg Thunderbolt Driver on an Apple silicon-based Mac on macOS 11 or later, the macOS security policy needs to be changed. After that, the driver can be installed using the same procedure as under macOS 10.13 (High Sierra) or later. Please follow the instructions below.

Change the macOS security policy

This is required only if the Yamaha Steinberg USB Driver, the Yamaha Steinberg Thunderbolt Driver or the TOOLS software that includes the driver is installed on an Apple silicon-based Mac for the first time.

To install the driver or the TOOLS on Macs with Intel processors, please skip this section and go to "Install the driver or the TOOLS software package"

Shut down your Mac
Press and hold the power button until you see "Loading startup options …"
Your Mac will boot into Recovery mode
Click Options (gear icon), then click Continue
In macOS Recovery, select the volume on which you want to install the driver and click Next.
In macOS Recovery, choose your account and click Next. Enter the password and click Continue
In the top menu, go to Utilities → Startup Security Utility
Select the system on which you want to install the driver. If the disk is encrypted with FileVault, click Unlock, enter the password, and then click Unlock
Click Security Policy, choose Reduced Security and check the option to allow user management of kernel extensions from identified developers
Click OK. Enter the password for your account and click OK.
Restart your Mac from Apple menu

Install the driver or the TOOLS software package

This is required every time the Yamaha Steinberg USB Driver, the Yamaha Steinberg Thunderbolt Driver or the TOOLS software that includes the driver is installed.

(In the following explanation, dialogs shown during the installation of the TOOLS for UR-C are used as the example.)

1. Double-click the “.pkg” file in the driver or TOOLS package

2. Follow the on-screen instructions to install the software. If you see the message below, please do not forget to install Rosetta.

If you want to install the driver only, please skip to step 7 now!

3. Click "Continue" and follow the on-screen instructions to install the TOOLS.

4. When the installation of the TOOLS is completed, click "Close".

5. When this message is displayed, click "OK" to allow the installer to access the files.

6. When this message is displayed, you can either trash or keep the installer.

7. Click "Continue" here and follow the on-screen instructions to install the Driver.

8. Right after the installation is finished, you will see the message below.
Click "Open Security Preferences"

For now, ignore the Security & Privacy window that appears.

10. Bring up the "Install the Yamaha Steinberg USB Driver" or "Install the Yamaha Steinberg Thunderbolt Driver" window and click "Close" or "Restart" (depending on the version of the installer).

11. When this message is displayed, click "OK" to allow the installer to access the files.

12. When this message is displayed, you can either trash or keep the installer.

13. In Security & Privacy window, open "General" tab and click the lock in the bottom left and unlock Security & Privacy preferences.

14. Allow system software from developer "Yamaha Corporation" to be loaded