Hi. Best way to install dropbox on a second machine is to ensure that you have LAN Sync enabled on both PC's. Install dropbox on new PC and if they are both on the same LAN network then it will copy all your files across the network and not from the internet. That way it does everything and you have no syncing worries. LAN Sync is tucked away under dropbox Settings, Preferences, Bandwidth. Used that method just now and it worked like a charm. Cheers.
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