I am running my Sequoia o/s from an external drive. Here is the procedure that has been successful for me. SEQUOIA 15.3 UPDATE ON EXTERNAL DRIVE If you attempt to update to Sequoia 15.3, installed on your external drive, you will receive an error message "Requires operator input", or similar. Solution: 1.Ensure you are fully backed up and close down your Mac. 2. Press and hold down the on/off button, and eventually a window will appear with two icons. 3. Select the right handed icon and 4 Icons appear with text asking, "onto which drive do you wish to install the new O/S". 4. Select the external, (Acasis mounted drive, on my case), drive icon. 5. The new O/S will then be installed on your Mac: and my SIRI talks to me.
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I am running my Sequoia o/s from an external drive.
Here is the procedure that has been successful for me.
SEQUOIA 15.3 UPDATE ON EXTERNAL DRIVE
If you attempt to update to Sequoia 15.3, installed on your external drive, you will receive an error message "Requires operator input", or similar.
Solution:
1.Ensure you are fully backed up and close down your Mac.
2. Press and hold down the on/off button, and eventually a window will appear with two icons.
3. Select the right handed icon and 4 Icons appear with text asking, "onto which drive do you wish to install the new O/S".
4. Select the external, (Acasis mounted drive, on my case), drive icon.
5. The new O/S will then be installed on your Mac: and my SIRI talks to me.