Hmm that seems fine.
What if you run the upgrade in Chrome but you open up the "Developer Tools" in Chrome (F12) before you start. Then click on the network tab and keep it open, then run the upgrade. If there's an error again, you should notice one of the network requests timing-out or displaying an error. Click it and view the response so you can see the exact error that is being displayed.
Off-topic: yes, I do convert themes from vB3 to vB4.
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