After you've downloaded Build Your Web to your local machine and unzip the file, there are some more install and configuration to do. Here is a step-by-step instruction to do that:
Part 1: Install the Build Your Web App
Click on '+' button right to the combobox
Choose file 2sxcApp_BuildYourWeb_01.00.05.zip from your computer and start installation with button 'import'
Wait for installation to complete... (it takes about 5 min, be patient...)
Success!
Note: You may see a warning, that an image could'nt be copied, because it's already exist. You can ignore this message!
Test your installed app