I've tried to update Zope2.6.0 to 2.6.1 with Zope-2.6.x-to-2.6.1-win32-x86.gz.

But it seems that this file is corrupt or anything else. So I ma not able to update Zope.

Why don't you download "Zope-2.6.1-win32-x86.exe", try to overwrite the Data.fs* of the new installation and install the Products that you're using? I made the same, but with the linux versions and it worked. I don't know about Windows, but you can try. <http://www.zope.org/Products/Zope/2.6.1/Zope-2.6.x-to-2.6.1-src.tgz/view>Regards, Josef