Installing goes as with any other more.groupware module, the same goes for the rights.

Write access by the webserver is needed for:
workflow/inc/Galaxia/processes
workflow/templates/default/html (not to the files in it, just the dir itself)

The unix command
chown apache <dir>
can help you (if apache is the user running the webserver), or else (if you have only ftp access): chmod the directory so everybody can write to it.

