Comment 20 for bug 331342

I was able to install v2.5.1 with Qt interface on python 2.7 (64bit) using a bit longer route with unofficial binary packages. These are available for example from: http://www.lfd.uci.edu/~gohlke/pythonlibs/
My setup as almost according to http://wiki.bazaar.canonical.com/WindowsInstall. This is what I've used:
- pywin32-218.win-amd64-py2.7.‌exe
- curl-7.23.1-win64-ssl-sspi.zip (from http://curl.haxx.se/download)
- pycurl-7.19.0.win-amd64-py2.7.‌exe
- pycrypto-2.6.win-amd64-py2.7.exe (from http://www.voidspace.org.uk/downloads/pycrypto26)
- zlib127-dll.zip (from http://zlib.net)
- paramiko-1.7.7.1.zip (setup from source: http://www.lag.net/paramiko/download)
- PyQt-Py2.7-x64-gpl-4.9.6-1.‌exe (Qt GPL included + tools)
- bzr-2.5.1.win-amd64-py2.7.‌exe
- bzrtools-2.3.0.tar.gz (launchpad)
- qbzr-0.23.0.tar.gz (launchpad, setup from source)

Also I needed to correct c:\Python27\Scripts\bzr.bat to yield something like:
@C:\Python27\python.exe C:\Python27\Scripts\bzr %*

After all these steps 'bzr explorer' should launch.