There is indeed something wrong with package_index.json. Can you please do the following? Close Energia Type "file explorer" in the "Search Window" This will bring up a file explorer window. Paste "%LOCALAPPDATA%\Energia15\" into the location bar. You should see something like this. Drag package_index.json and package_index.json.sig to the Desktop. Attach them to this thread so that I can have a look at them. The action in stepĀ 4 should have moved