The LEGO Digital Designer installation process is non disponibile. Just download the LDD v4.3.11 installer from this link: https://cogmation.s3.amazonaws.com/downloads/setupLDD-PC-4_3_11.exe
Then follow the instructions of the installation wizard, accept the license terms, click Next, configure the shortcuts, click Next again and continue to follow the prompts.
Make sure to patch LEGO Digital Designer in the Help menu in Advanced Mode. To learn more about how to enter Advanced Mode, click here.