This is probably an error on itch.io's side, but I didn't get the file when I tried to "install" the sheet, it just created an empty folder. I saved it down to my PC from the Sheets version, so I did get it locally onto my computer, but it might be something you want to look into if you intend to publish any more updates through itch.io sometime. The sheet looks great, I'll have to edit colours a bit for it to work with dark mode but it's nothing compared to having to do everything from scratch for myself haha!