Let’s get things on track for you. First- download a fresh copy of EE. That auth error is odd and there were some hotfixes that shouldn’t be related to your install/update issue, but better to have a fresh, clean copy.
Next- do you want to try the update again or a clean install? If you’re wanting to upgrade, I’d tend to say let’s just work our way through that.
If so- what version are you updating from? The error you ran into? Occurs in the 2.1.2 update:
$Q[] = "ALTER TABLE exp_members ADD show_sidebar char(1) NOT NULL default 'y' AFTER quick_tabs";
$Q[] = "ALTER TABLE exp_member_fields ADD m_field_cp_reg char(1) NOT NULL default 'n' AFTER m_field_reg";
Sometimes that will happen if the updater tries to run the same script twice. One thing to do if you try to update and get the same error again? Go in and see if all of the other queries for that update have been run.
For example- does the exp_member_fields table have a column called m_field_cp_reg in it? If so- that query has also been run. If you track that update file to the end, the last query is
$Q[] = "UPDATE exp_comments SET location = '' WHERE location = '0'";
So- if in exp_comments the location field has no 0 values- and empty field instead? All the queries actually ran succussfully.
We can manually change the config to show you’re running 2.1.2 and then restart the update- which should start running the 2.1.3 update.
But I know that’s a lot to parse. So let’s just run the update, see if it does fail in the same spot- if it does, let me know if those other queries I mention above executed.
And if any of that was confusing, let me know and I’ll walk you through it in more detail.