我正在尝试在win8机器上安装Python2.7的Scrapy包，但是得到了错误。
Downloading/unpacking Twisted>=10.0.0 (from Scrapy)
Downloading Twisted-14.0.2-cp27-none-win_amd64.whl (3.1MB)
←[K 100% |################################| 3.1MB 5.8kB/s ta 0:00:01
←[?25hRequirement already satisfied (use --upgrade to upgrade): w3lib>=1.8.0 in c:\python27\lib\site-packages\w3lib-1.10.0-py2.7.e
gg (from Scrapy)
Requirement already satisfied (use --upgrade to upgrade): queuelib in c:\python27\lib\site-packages\queuelib-1.2.2-py2.7.egg (from
Scrapy)
Requirement already satisfied (use --upgrade to upgrade): lxml in c:\python27\lib\site-packages (from Scrapy)
Requirement already satisfied (use --upgrade to upgrade): pyOpenSSL in c:\python27\lib\site-packages\pyopenssl-0.14-py2.7.egg (fro
m Scrapy)
Requirement already satisfied (use --upgrade to upgrade): cssselect>=0.9 in c:\python27\lib\site-packages\cssselect-0.9.1-py2.7.eg
g (from Scrapy)
Requirement already satisfied (use --upgrade to upgrade): six>=1.5.2 in c:\python27\lib\site-packages\six-1.8.0-py2.7.egg (from Sc
rapy)
Downloading/unpacking zope.interface>=3.6.0 (from Twisted>=10.0.0->Scrapy)
Downloading zope.interface-4.1.1.tar.gz (864kB)
←[K 59% |################### | 516kB 1.5kB/s eta 0:03:52 Hash of the package https://pypi.python.org/packages/sour
ce/z/zope.interface/zope.interface-4.1.1.tar.gz#md5=edcd5f719c5eb2e18894c4d06e29b6c6 (from https://pypi.python.org/simple/zope.int
erface/) (e6277d288c100478bf348ac91333620f) doesn't match the expected hash edcd5f719c5eb2e18894c4d06e29b6c6!
Cleaning up...
Bad md5 hash for package https://pypi.python.org/packages/source/z/zope.interface/zope.interface-4.1.1.tar.gz#md5=edcd5f719c5eb2
e18894c4d06e29b6c6 (from https://pypi.python.org/simple/zope.interface/)
请有人能建议我吗？