Is there a way to upgrade MacOS without using the app store?
I am trying to do a hard update to my iMac 21.5 (late 2013) and bring it up to Catalina from Yosemite. When I try to download it from the app store it asks for apple ID authentication and expects a 6-digit passcode but there is nowhere to enter it. Any advice? Is there a way to upgrade macOS without going through the app store?
iMac 21.5″, OS X 10.10