click the resource extension in ur extension list and select the latest version. u should be able to get it by restarting now
also for that 1kb i encountered the same issue many times, u have to redownload it until it gets the full size. for that which now i just use ctrl + save to download the html unless it's zip, i alternate using an extension
EDIT: splunko is recreation. i found it on itch
Thanks, i finally got the sb3 :)