I have tried with no success to have Magit running under Aquamacs (GNU Emacs 23.4.1). I have followed these steps:
1) I installed Marmelade package manager following these steps (so far so good)
2) M-x package-list-packages (so far so good)
3) I selected and installed Magit from the the list. Here first problems, installation resulted in some errors (unfortunately I haven't copied them). I remember could have been concerning the fact that some files couldn't be written...
4) Reopen M-x package-list-packages. Magit now is at the bottom of the list and results as "Installed"
5) Try M-x magit-status. Result: "Cannot open load file cl-lib".
6) Try to uninstall magit via Marmelade:
condition-case: Wrong type argument: stringp, #[(directory &optional recursive
[directory handler recursive delete-by-moving-to-trash directory-files-no-dot-files-regexp directory-file-name expand-file-name find-file-name-handler delete-directory directory-files ...] 7 1863847 (let ((dir (expand-file-name (read-file-name "Delete directory: " default-directory default-directory nil nil)))) (list dir (if (directory-files dir nil directory-files-no-dot-files-regexp) (y-or-n-p (format "Directory `%s' is not empty, really delete? " dir)) nil)))]
The version from Marmalade is very old. The recommended way to install Magit is to use the other Elpa package archive: Melpa. See the updated installation instructions in the README.md.