I think that's normal (no preview/preview not working). It shouldn't be affecting the download.
The Box download won't work for me, either, but axfc worked! I'm not sure what issues you may be having with axfc, so I'll just list a few suggestions:
- Password/key is reizovcv2 if it's not there already
- It may ask you to input 3 letters from an image on the right. Only letters, no numbers (I typed a zero instead of an uppercase O, so I had to start over...)
- Once you enter the password and letters, the next page should say something like this:
しばらくお待ち頂きますとダウンロードがはじまります。
5秒経っても ダウンロードが開始しない場合は、こちらをクリックしてください。
Click こちら. You're only supposed to do that if the download doesn't start in 5 seconds, but I always click it. It's more likely to work, at least for me. I hope this helps!