Once you've created a new project you can try to fetch all available translations and create the language packs. To do this on the projects screen in the status column you'll see a button with 2 arrows -> just press it and a modal window will appear. Click on "Get data" and let the script do its job.
Taking all resources from transifex.com is a time intensive task. Depending on how many resources and languages your project has it can take just 5 mins or 30. Don't refresh the page while the script is working. If the script is not responding for more than 2mins it means that something went wrong. You can contact us for support or try to debug the Ajax request and see what's going on.
Packs are saved in /media/com_ctransifex/packages/