There have been a number of people reporting difficulty in accessing the updated version of Andrea Rossi’s paper “E-Cat SK and long-range particle interactions” from the ResearchGate page where it has been posted.
I was able to download a version myself, so I am uploading it here, hopefully it will not cause any problems for people.
ECatSK_and_lrpi2.1https://e-catworld.com/wp-content/uploads/2020/12/ECatSK_and_lrpi2.1.pdf