> I am also wondering if update is good way to update my own code. I am actually thinking distributing my own pharo distribution for a project I am making called "Ephestos" (for visual and live coding, think of it as a simplification of Pharo with eye candy but of course still very compatible with pharo and squeak) and I wanted to provide to my users a super easy "update" button to do its magic. 

the update mechanism is working well. this is unrelated to metacello.

Stef