Download the script here-> FP's gaussian blur all layers script
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To this:

Download the zip file, open the zip file by double-clicking on it and copy/paste the script to your GIMP scripts folder (ie...C:\Program Files\GIMP-2.0\share\gimp\2.0\scripts). Refresh your scripts and you're ready to go. The script can be located under the Filters > Blur > Gaussian Blur All Layers...
Let me know if you have any trouble or need additional information.
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