Unable to download, save and verify the package. Check your internet connection.

Hello. I'm new to this whole MuseScore thing, and after watching a ton of videos about it I was so hyped to download it and try it out. And so I did. But everytime I try to download the MuseScore drumline extension, I keep getting the message "Unable to download, save and verify the package. Check your internet connection." even though our wifi speed isn't a problem. How do I resolve this issue? Also, I'm a Windows 10 user.