I bought three cards recently, the first two downloaded successfully, the last one (Viola and Merry Pie No. 0044) did not download at all. When I looked at the advanced settings, it states 1 download remaining with a positive value for downloading it (~500 KB s^-1). However, it still stays at 0%. My version is 1.2.0.84 (Qt 5.3.1) so it should work as well.

Quick answer is to quit VG completely then restart. This will often kickstart a download for me :)