Hi, our current Compression package does not support Zip64 which is limiting us in usage of Metacello together with Git. When we use the Metacello for installing of a baseline like: Metacello new baseline: 'IDE'; repository: 'github://guillep/pharo-core'; load. then the Metacello downloads the corresponding archive from Github. However the standard Zip archives have count limit of 65535 members but the pharo-core repository and some others contain much more than this (pharo-core has 125021 files). The Zip64 extension is used for them during compression which we cannot read now. So if you will see Error: bad signature 16r... at position ..., then it has this reason. The workaround for now is to load projects from a local clone of such big repositories. Cheers, -- Pavel