Download the Adobe Air and Scratch files from:
https://scratch.mit.edu/scratch2download/
The following libraries are needed:
sudo apt-get install libxt6:i386 libnspr4-0d:i386 libgtk2.0-0:i386 libstdc++6:i386 libnss3-1d:i386 lib32nss-mdns libxml2:i386 libxslt1.1:i386 libcanberra-gtk-module:i386 gtk2-engines-murrine:i386
Now you have to create a symbolic link to your gnome keyring:
sudo ln -s /usr/lib/x86_64-linux-gnu/libgnome-keyring.so.0 /usr/lib/libgnome-keyring.so.0
sudo ln -s /usr/lib/x86_64-linux-gnu/libgnome-keyring.so.0.2.0 /usr/lib/libgnome-keyring.so.0.2.0
cd into the directory with the AdobeAIRInstaller.bin
sudo ./AdobeAIRInstaller.bin
Now install Scratch 2:
sudo "Adobe AIR Application Installer" /path/to/scratch2/installer/Scratch-437.air