They really should update the Links Ngl. current one is Ages old and significantly more difficult to use. Also the "Tutorial" Video is not embedded anymore. Simply shows a blank Link
Due to recent updates to the forum code, embedded videos in old posts don't work anymore. I modified the link so the "Tutorial" video is back, thanks to point that out.
What is shown in that video could be significally different in the version you asked above though, because the user
ePayload modified the code used in OP. ePayload was active also in Discord servers, but last time he was active here was in 2020.
I uploaded what I believe it's the latest offline version downloaded from those links above and made it publicly available from my account. Extract the folder and run nw.exe. See the folder for a readme file describing some commands. Place the .pak file in SpaceEngine /addons folder.
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Offline sc-editor 0.31 <<