After installing sage 6.6, I tried to install the optional packages 4ti2, 
macaulay2, and nauty but the command

sage -i 4ti2

returns:

/Applications/sage/src/bin/sage-spkg: line 312: cd: 
/Applications/sage/upstream: No such file or directory
Attempting to download package 4ti2
>>> Checking online list of optional packages.
[Traceback (most recent call last):
  File "<stdin>", line 35, in <module>
  File "/Applications/sage/local/lib/python/urllib.py", line 240, in 
retrieve
    fp = self.open(url, data)
  File "/Applications/sage/local/lib/python/urllib.py", line 208, in open
    return getattr(self, name)(url)
  File "/Applications/sage/local/lib/python/urllib.py", line 359, in 
open_http
    return self.http_error(url, fp, errcode, errmsg, headers)
  File "/Applications/sage/local/lib/python/urllib.py", line 376, in 
http_error
    return self.http_error_default(url, fp, errcode, errmsg, headers)
  File "<stdin>", line 17, in http_error_default
IOError: [Errno 404] Not Found: '//www.sagemath.org/spkg/optional/list'
Error: failed to download http://www.sagemath.org/spkg/optional/list, 
aborting

I get the same output for the other two packages. Furthermore, the webpage

http://www.sagemath.org/spkg/optional/list

returns the error: 404 Error: page not found

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