I have now certainly confirmed that it is caused by "Windows Defender".
If the error can be reproduced on my computer,i have Microsoft analyze it.
If you're in a hurry, change your Windows Defender settings and set an exception for the downloaded file.
Or maybe the ZIP file cannot be opened?
I had something similar case before, and I've solved it by putting my files on another server, can you give it a try?
http://dindin.sakura.ne.jp/voero2020/hokenya_yukarin_en.zip