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To remove a Mac password in 2016 version or earlier you h...

To remove a Mac password in 2016 version or earlier you have to send the file to support. However... there's no reason the administrator password would stop working. Make sure you are opening the correct company file.  If you've saved the admin password to your Mac keychain you can find it with Apple's Keychain Access tool - use Spotlight to open that.  Once keychain access is open type QuickBooks User in the search field and it should show you any saved password entries. Double click on those, enter your Mac account log in password, and you should see your admin password(s).