Click on the Raw button on the script page to get the actual script file, then use File > Save As.. to save the script. Do not use right click > Save As.. on the script link as this will save the HTML ...
The following librariers are required in addition to those required to build DOSBoxECE vanilla. Unknown at this time. I may switch to DOSBox Staging / DOSBox-X or I may update directly from SVN ...