Updated INSTALL file

setup.py does not require an Internet connection nor setuptools. That was
fixed in [3906]. Updated the minimum Python version as well.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@11684 bcc190cf-cafb-0310-a4f2-bffc1f526a37

INSTALL

 Thanks for downloading Django.
 
-To install it, make sure you have Python 2.3 or greater installed. Then run
+To install it, make sure you have Python 2.4 or greater installed. Then run
 this command from the command prompt:
 
     python setup.py install
 
-Note this requires a working Internet connection if you don't already have the
-Python utility "setuptools" installed.
-
 AS AN ALTERNATIVE, you can just copy the entire "django" directory to Python's
 site-packages directory, which is located wherever your Python installation
 lives. Some places you might check are:
 
+    /usr/lib/python2.5/site-packages (Unix, Python 2.5)
     /usr/lib/python2.4/site-packages (Unix, Python 2.4)
-    /usr/lib/python2.3/site-packages (Unix, Python 2.3)
     C:\\PYTHON\site-packages         (Windows)
 
-This second solution does not require a working Internet connection; it
-bypasses "setuptools" entirely.
-
 For more detailed instructions, see docs/intro/install.txt.