At the moment, GitHub has taken the script down because they think the user account is a robot...

Copy and paste script below.

#!/bin/bash


#
##
####
####
####                              This is a bash script for installing Demonsaw Linux v2.02. 
#### 
####
####       As of 9/08/2015, it is confirmed to work on both the x86_64 (64-bit) and i686 (32-bit) versions of the following Linux distros:
####
####            
####                |  Kali Linux 2.0  |  Ubuntu 14.04.3 LTS  |  Linux Mint 17.2 Rafaela  |   Elementary OS Freya 0.3.1  |
####
####    
####
####    
####
####
####  Before installing:    
####  ------------------
####    
####
####   !!!) IMPORTANT: Save this script as "install-demonsaw-linux" (without quotes).
####    
####    !!)  Make sure to apply "chmod +x install-demonsaw-linux" to the script before running.
####
####     !)  If you get any permission errors, trying running script as sudo.
####
####
####
####
####  After installing:
####  -----------------
####    
####    ) Demonsaw will automatically start after installation.  
####       To re-launch at any time, navigate to the 
####       install directory and run "sudo ./demonsaw"
####
####    ) Visit https://demonsaw.com/ and see the downloaded ~/demonsaw/README.TXT file for more information.
####        
####    ) Look in https://www.reddit.com/r/demonsaw for extra stuff.
####
####    ) For a quickstart, after Demonsaw launches, click the "+" button in the top left corner to add a new Client.  
####       In the newly created "Client" window, replace the default IP
####       "127.0.0.1" in the Address box with, "bucket1.demonbucket.com" 
####       (add the address without the quotes and no extra spaces on either side)
####       Check the Enable box and wait for the client icon illuminate green.
####
##
#


echo
echo
echo


mkdir -p ~/demonsaw
cp -f install-demonsaw-linux ~/demonsaw/install-demonsaw-linux
cd ~/demonsaw

echo
echo
echo

sleep 1

echo "Downloading files securely from demonsaw.com"

echo
echo
echo


#### Checks architecture and downloads appropriate .zip file from demonsaw.com.
###
##
#
#
if [[ $(uname -m) == 'x86_64' ]]; then
    echo "Downloading 64 Bit Version"
    echo "--------------------------"
    echo
    wget -N --https-only https://www.demonsaw.com/download/v2-02/demonsaw_linux64.zip
else
    echo "Downloading 32 Bit Version"
    echo "--------------------------"
    echo
    wget -N --https-only https://www.demonsaw.com/download/v2-02/demonsaw_linux32.zip
fi



sleep 1



####  Creates a sha1sum hash file as listed at https://demonsaw.com/download.php
###
##
#
#
if [[ $(uname -m) == 'x86_64' ]]; then
    echo "c4171d3e3307701e96d768236ab8e1afc58ef8b7  demonsaw_linux64.zip" > demonsaw_linux64.zip.sha1
else
    echo "720737CBF665A510F7C786C43DC35150CE5411E9  demonsaw_linux32.zip" > demonsaw_linux32.zip.sha1
fi



echo
echo "--------------------------"
echo

echo "Verifying SHA-1 hash with sha1sum..."

echo
echo
echo


####  Confirmation of SHA-1 hash based on architecture being printed to screen.
###
##
#
#
if [[ $(uname -m) == 'x86_64' ]]; then
    echo "The SHA-1 hash for demonsaw_linux64.zip (v2.02) is: c4171d3e3307701e96d768236ab8e1afc58ef8b7"
else
    echo "The SHA-1 hash for demonsaw_linux32.zip (v2.02) is: 720737CBF665A510F7C786C43DC35150CE5411E9"
fi


echo
echo
echo

sleep 3


####  Runs sha1sum to compare the hashes of the downloaded zip files to the SHA-1 hashes listed at https://demonsaw.com/download.php
###
##
#
#
if [[ $(uname -m) == 'x86_64' ]]; then
    sha1sum --check --strict demonsaw_linux64.zip.sha1
else
    sha1sum --check --strict demonsaw_linux32.zip.sha1
fi



####  Confirms the results of sha1sum, and prints to screen.
###
##
#
#
if [ $? -eq 0 ]; then
    echo
    echo
    echo
    echo "The hash is valid.  To further verify, visit https://demonsaw.com/download.php."
    echo
else
    echo
    echo
    echo
    echo "WARNING: The hash appears to be INVALID, please cancel installation and verify at https://demonsaw.com/download.php"
    echo
    echo
    echo
    exit
fi

sleep 3

echo
echo "--------------------------"
echo "Enter password in install."
echo "--------------------------"
echo



####  Installs the required libxcb packages to launch Demonsaw in the X Window System.
###
##
#
#
sudo apt-get update -y && sudo apt-get install -y libxcb-render-util0 libxcb-image0 libxcb-icccm4 libxcb-randr0 libxcb-keysyms1 && sudo apt-get autoclean


echo
echo
echo


####  Creates a symbolic link between newer and older library files for redundancy.
###
##
#
#
if [[ $(uname -m) == 'x86_64' ]]; then
    sudo ln -f -s /usr/lib/x86_64-linux-gnu/libxcb-sync.so.1 /usr/lib/libxcb-sync.so.0
    unzip demonsaw_linux64.zip
else
    sudo ln -f -s /usr/lib/i386-linux-gnu/libxcb-sync.so.1 /usr/lib/libxcb-sync.so.0
    unzip demonsaw_linux32.zip
fi


echo
echo
echo


####  Checks to see if the Demonsaw program file was created, adds execute privileges, and prints confirmation to screen.
###
##
#
#
exists=./demonsaw
if [ -f $exists ]; then
    chmod +x demonsaw
    echo "The installation was successful."
else
    echo
    echo
    echo
    echo "Installation failed."
    echo
    echo
    echo 
    exit
fi



echo 
echo
echo


####  Prints the post installation notes found at the top of this script.
###
##
#
#
sed -n '27,49p' install-demonsaw-linux | grep --color=always -B 5 -A 18 "After installing:"

echo 
echo
echo

####  Launches demonsaw.
###
##
#
#
sudo ./demonsaw

echo
echo
echo