Sample skins cannot be downloaded properly

The bug

When trying to download the sample skins, the launcher will open a dialog window with which you can choose the destination of the sample skin file. However, the sample skin won't be downloaded.

To reproduce

1. Open the launcher
2. Go to the "skins" tab
3. Click on one of the links below "Sample skins"
4. Choose a folder on your computer
5. The sample skin won't be downloaded

Original description

Hello,

I recently tried to download skin smaples via launcher (tried on both my mac and win10 machines) and could not do it. After pressing `save` button nothing got saved. Possibly that's some bug of the launcher?

Best wishes,
luna_koly