You do not have permission to open the application “Brother Scanner”.

This happened to me when I tried to open the scanner from within the system preference pointers and scanner. I think it happens because the printer/scanner driver is old, and does not go well with Big Sur. Brother, apparently, stopped issuing new drivers with OS 10.15.

Go to the Apple applications store, and download the most recent version of "Brother iPrint and Scan". Open the scanner, or initiate a scan, from within this application. when I initiate from within the new brother software, rather than from within apple software, it works.

Following. I have this issue too.

• Mac mini (M1)
• macOS Big Sur (11.5.1)
• Brother MFC-8910DW which supports AirPrint.
• Scanning works on other devices (macOS, iOS)
• Printing works on all devices.
• Scanning works in the Brother app (though it isn't as good as Apple's Preview. "Native" scanning would really be nice to have again.

That's a shame, I didn't think there were companies as big as Brother that would just sell their products without support after it. The product works well. But no proper driver. This is their answer: https://help.brother-usa.com/app/answers/detail/a_id/171587?R3ModelID=MFC9330CDW&_ga=2.74734098.1212927454.1628149942-372246198.1628149942. I wouldn't have thought they would recommend the wobbly solution I use to all users... but they did without even blinking. "Brother: at your side."

Try using VueScan? They support a myriad of Brother scanners.

I’ll be trying the following in a local test environment over the next couple of days:

https://apple.stackexchange.com/questions/408752/the-message-you-do-not-have-permission-to-open-the-application-is-shown-when-t

https://stackoverflow.com/questions/64842819/cant-run-app-because-of-permission-in-big-sur

My ADS-1500W desktop scanner ( a fabulous device) stopped working today after a number of Big Sur updates. Must use image capture, Brother Iscan doesn't support it anymore. Scanner is fine as I ran it with Windows machine and it is perfect. I have all my records on the Mac so it is a huge pain to scan to a windows machine and send them to my Mac. I get it that technology improvement can advance the cause, but this is a bummer. Any suggestions on a solution will be welcome. Also brings up Must be an administrator upon launch.

This also happened to me on Big Sur, with the alert You do not have permission to open the application "Brother Scanner".

I was able to solve it as follows:

• Remove the existing printer from System Preferences.
• Uninstall the existing Brother drivers, using the procedure given here: https://help.brother-usa.com/app/answers/detail/a_id/56738/~/uninstall-the-brother-software-and-printer-driver---macintosh-os-x
• After a reboot, I reinstalled the Brother software for the latest macOS version 10.15 (even though my Big Sur version 11.5.1).
  • There are two parts to this: the "Printer Driver" and the "Scanner Driver (ICA)". I installed both.
• After another reboot, I added my brother printer anew using the System Preferences (under "Printers & Scanners").
• I was then able to use my Brother MFC as a scanner within macOS Preview on macOS Big Sur, as I did before under Catalina.

I've never used the Brother iPrint&Scan software and am very happy using macOS preview for my scanning needs (other than duplex scanning in the document feeder where we have to turn over the block of pages -- please improve that for us!)

The above worked when upgrading my Intel Mac Mini to Big Sur. It also worked with my M1 MacBook Air, which was previously upgraded from an older laptop using the macOS Migration Assistant.

Anyone who has a working Twain or WIA (NOT VUESCAN) scanner on a Windows machine can now share it with OSX, Android, iOS, ChromeOS, and Linux over the eSCL protocol.

It is free for personal use.

for more info look for Twain2AirScan at http:///scannershare.om