In some cases with Studio 16 download installations Pando Media Booster may fail to install. If this occurs, begin by checking with the Pando website for possible solutions:http://www.pandonetworks.com/games/help
If the issue persists, download Pando Media Booster from the following link and install it:
Pando Media Booster Installer
Once it is installed you should be able to properly download Studio 16 and all included content.