Slitherine

Yesterday evening I bought DaF online.
But, when I tried to save it on the computer as I did the other times - in order to copy it later on my laptop - I found it was impossible because I was only allowed to execute it.
How can I now upgrade also the laptop to Daf?
Is there something I'm missing?

Thank's a lot for your help.

The problem is solved!
For some unknown reason the file had been downloaded not on the desktop but in another folder.

Sorry!