You can clone with
HTTPS or Subversion.
To install multiple instances on the same domain you must disable Application variable feature on each additional ASG installation to prevent conflicts with the first one.
To do this open the file myasg/config_common.asp with your favorite text editor (for example Notepad or PSPad) and search the line
blnApplicationConfig = True
Change the variable to false and save the file.
blnApplicationConfig = False
Apply this change to all your instances except one: your favorite one or the one that tracks your most visited website.