That worked! Thank you so much. The warning to pick the correct app named in the error message is important. I first selected the highest-numbered version (15), but it was the version IJScanner14 that was the right one. Now scanning again. Thank you!
I'm having the same problem here with a MG7520. Deleted all the printer connections and then added back one MG7500 series. Have checked the security preferences, and it is set to allow all Apple and identified developers. I am in the admin account, ...
