Version 10 (modified by toby, 3 years ago) (diff)


Installing GSAS-II on Windows with Anaconda

You will need to know if you are running 32- or 64-bit Windows (click here if you are not sure). Note that if you have 64-bit windows, you will likely find it easier to use this installer.

  1. Download the appropriate 64- or 32-bit Anaconda package from Continuum Analytics, Inc. download page. Important: make sure to use the Python 2.7 installer and to select the appropriate version, 32- or 64-bit, for your computer. (There is no cost for this, but Continuum will ask for your e-mail address.) Use of miniconda, which is much smaller, is also possible, but for that more packages must be installed.

You will download a file such as "Anaconda2-x.x.x-Windows-x86.exe" (32-bit) or "Anaconda2-x.x.x-Windows-x86_64.exe (64-bit), or Anaconda3- to use Python 3.x. If needed, click on the file you downloaded to run the installer. The following steps are then needed:

  1. Accept the copyright (end-user) agreement
  2. Install for "Just me" (there have been occasional problems reported with "All users")
  3. Make a note of the installation location
  4. Suggestion: leave "Add Anaconda to your path" and "Register Anaconda" unchecked, unless you plan to develop your own Python code.
  5. It then takes a few minutes to install Python.
  6. Once the software is installed, it is OK to un-check the boxes on the final "Thank you" screen.
  1. Once Anaconda is installed, in the Windows Apps or "All Programs" menu, find the Anaconda2 menu and select "Anaconda Command Prompt" menu item. This will open a cmd (DOS) window. In that window type the following commands:

conda install wxpython

conda install svn

conda install pyopengl

After each command you will need to type "y" at the "Proceed?" prompt.

I believe that this will install all needed and recommended packages, but it will not hurt to check this using this command:

conda install numpy scipy matplotlib pillow h5py imageio

If you used the miniconda installer, you must use this command.

  1. Create a directory for GSAS-II and download the install script

In the Anaconda Command Prompt cmd (DOS) window, type the following command:

mkdir GSASII

Download the install script from this ​link:

Use your web browser to save this file into the GSASII directory you created above.

Run this file inside Python with this command:

python GSASII\


python \Users\<me>\GSASII\

This will cause a questions to be asked about a web proxy see below. Most people will not need a proxy, so the usual response is to simply press Return

After the script completes, a file named RunGSASII.bat is created with the locations of GSAS-II and Python hardcoded. You should have a shortcut to start GSAS-II on your desktop linked to that .bat file (see screen image). GSAS-II project files (with extension .gpx) will appear with the same icon and clicking on them will open them in GSAS-II. If Python or GSAS-II are ever moved to new locations, or if these programs will be installed on a centralized server and a shortcut is needed for each machine, this script can be rerun using a command such as

python \Users\<me>\Desktop\GSASII\

to create new versions.

Note that the file can be rerun at any point without problems. This causes a download of updates to GSAS-II (only), so this should complete very quickly.

Proxy address

If GSAS-II fails to be installed, you likely have a network access problem, most commonly because you need to use a network proxy. This is not common at universities, or at private networks, but is common for government and corporate sites. When one is needed, it will typically be of form such as If you are not able to get the GSAS-II download to work, you probably need a proxy. Check with your network/computer administrators. My experience is that the first-line response people will have no knowledge about proxies, alas. You may be able to get information from this website: If a web proxy is needed, supply the address ( for the first prompt and the port number (7070) for the second.

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