I found some bugs in Installer and InstallerMonticello packages. Is this the properly forum to report them? If not, sorry for bother you. InstallerMonticello >>mcDetectFileBlock: The detection is made with #beginsWith:, but if you have two different packages which begins with the same string, it would detect a wrong package. Reeplaced by #copyUpToLast: $- InstallerMonticello >>mcSortFileBlock If the file has no number (it could happen, yes, and it happened to me with a file create by MonticelloConfiguration, which I didn't remember it existed) the files collection is sorted wrongly, since #asInteger will answer nil. Replaced #asInteger by #asNumber I made other modifications, but I'm not sure they are part of the developing plan of the package. Errors are logued only with an output on the Transcript, so it's very difficult to separate errors form manu other messages shown there. I add a #logErr: method which adds the string to a new instance variable in. I attached the package.