software update asking for admin user and password. help
what is system admin user and password to update software
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When you initially set up your computer you were required to assign a user ID and password. This password is required for installing a new operating system as well as for making certain changes to the computer. Follow the instructions in the link below and then write down your password and save it in a secure place for needed future reference.
Change or reset the password of a macOS user account - Apple Support