Fail to install MuseScore Drumline

Dear Sir/Madam,
I am writing to report that there is a failure in installing Drumline. I really want to get it and I try many times. There is still a window that ask me to check the internet connection and try again. However, my internet connection is functional all the times. I don't understand where the bugs come from. Hope you can help with this problem. Looking forward to your response.
Best regards,
Luke