5 November 2018:

1) Download latest glider guns from https://github.com/ceebo/glider_guns/archive/master.zip

2) Decompress that ZIP archive to a folder, and open that folder.

3) Inside the newly created folder, everything will be inside a subfolder called glider_guns-master.

4) Copy and paste the contents of _this_ folder (containing this readme file) --

    glider-gun-builderv2.8.py,
    'template' folder,
    'glider_guns-master' folder (containing a 'fixed' subfolder with just one file in it)
    readme.txt (this file)
    
-- into your newly created folder.  If you've done it right you should have to confirm the replacement of one RLE file, p00940.rle.

In your folder you should now have

  glider_guns-master (subfolder)
  template (folder)
  glider-gun-builderv2.8.py
  readme.txt (optional)

5) In Golly, run glider-gun-builderv2.8.py.  New folders 'guns' and 'LHguns' will be created in the same folder as the script.

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The script works according to the current README, so if the ceebo/glider_guns repository has been updated since 5 November 2018, the script may report some revised guns that it is unable to build.  Otherwise you should eventually see a summary saying that 1011 gun patterns have been created successfully.