Buying VNs in digital download

I'd like to buy a few VNs in digital download, but I haven't understood in how many computers I can install a downloaded VN.
I can't download games directly from my pc. So I'd like to download them from another pc and then to install them on my computer. But I'm not sure I can do this. I'd like to download them from www.dmm.co.jp. On that site, I've read this page, where I've read this:

購入前にお読みください

■DRM形式とは？
DRM形式は、DRM（著作権保護）化されたファイルです。
DRM形式はDMMの登録が有効な限り、ダウンロードしたパソコンにて何度でもゲームをプレイすることができます。
ただし、ダウンロード後にDMMを完全退会されるとプレイできなくなります。
※DRM商品のライセンス権限はお客様1人に対し、1ライセンスとなっております。

"ダウンロードしたパソコンにて何度でもゲームをプレイすることができます。" means I can play a game as many times as I want on the pc I downloaded it, but I can't understand if I can install it on another pc.

So, if anyone has already downloaded something from that site or another (like gyutto or dlsite), I would like to know from them if I can play a game on a pc that is not the one I used to download it.

Thanks in advance.