iLife re-download

Ok, so I recently got my Macbook air mid 2013 from the servis, and today I wanted to play around with iMovie a little. But I found out that none of the iLife apps were istalled. So I go to the Mac App store to re-download it. I've located iMovie and saw this:

I then clicked accept and I had to put in my Apple ID which I did, then i clicked accept:

but nothing happened.

Can you please help me?

P.S. They reformated my SSD and they installed a new motherboard.