I have the same issued on my new windows 10 laptop, did turn off antivirus and/or firewall software, turn off proxie detection at time of download and install but it did not let me enter my email address to link account.
I have contacted business support they gave ticket # but did not give me instruction or help to resolve. So why Dropbox charged me $1K/year and couldn't deliver the service or assistant. If Dropbox wants to continue to charge me $1K for next year renewal; then find someone to talk to me. Here is my ticket#8633820
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