Magento – magento 2.2.0 Error:: “you did not sign in correctly or your account is temporarily disabled”

Found the solution.

composer require magento/product-enterprise-edition 2.2.0 --no-update
rm -rf vendor/*
composer update

Beware though, many extensions won't work in 2.2.0, you may need to cleanup your composer.json then reinstall the module one by one.

Those lines are most likely ones in your layout XMLs:

Element 'block', attribute 'type': The attribute 'type' is not allowed.
Line: 776

Element 'block', attribute 'type': The attribute 'type' is not allowed.
Line: 783

Element 'block', attribute 'type': The attribute 'type' is not allowed.
Line: 816

Most likely in layout XMLs you have declarations like

<block type="..."

Which does not correspond to lib/internal/Magento/Framework/View/Layout/etc/elements.xsd and need to be replaced to

<block class="..."