Failed at Dropbox check

[David Mead]

Trying this out and everything was going well until it got to Dropbox.

As I already have that installed I expected it to skip, but it failed at that point with this error in the log.
`ESC(BESC[m [↓] Installing dropbox Error: It seems there is already an App at '/Applications/Dropbox.app'.

 Formation failed `

Any ideas?