I use Metacello and that seems to be different in behaviour. I prepared the case for you. What I did

- save the attachment of this mail into a clean directory and open a terminal there

$> unzip baseline-of-zincproblem.zip

$> curl get.pharo.org/64/61 | bash

$> /Applications/Pharo64.app/Contents/MacOS/Pharo ./Pharo.image eval ���Metacello new repository: 'filetree://src'; baseline: 'ZincProblem'; load"

Look at ZnClient>>#downloadEntityTo: 

Norbert