Well ... if you take a look at
浜永の特選ペーパークラフト you will notice that there are many dead links.
A good example of how one should grab it now so that they can build later.
On a side note. It's a great idea to keep a record of the designer and provider/link to the model when you download it. So if the model is gone and you decide to build it, you can give credit to the designer instead of this...
"I'm building an Mini from someone I can't remember who because I downloaded it a couple of years ago and forgot the link"
It helps.