I get this message when I try to upgrade my Magento 2.0.2
Sorry, we can't take that action right now.
- Cronjobs works, no migration tool
- Repositories already in composer.json file and no data migration tool
- Logged in and key saved
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As soon as you used composer without the web wizard once to install Magento or extensions, the web wizard does not work anymore.
Solution: Switch to the command line and update using composer. To see how that works, read How to update Magento2 using composer