Hi Marc 

Once you have your downloadable set up in the GameSparks portal.

You can use a getDownloadablerequest to get a URL for the downloadable 

In Unity the code for this is

using GameSparks.Api;

using GameSparks.Api.Requests;

using GameSparks.Api.Responses;

new GetDownloadableRequest()

   .SetShortCode(shortCode)

   .Send((response) => {

      DateTime? lastModified = response.LastModified; 

      GSData scriptData = response.ScriptData; 

      string shortCode = response.ShortCode; 

      var size = response.Size; 

      string url = response.Url; 

   }); 

In Unity you can use WWW to get the file and then save it.

Regards

Katie