Using Git version

Windows

git clone https://github.com/armory3d/armory
git clone https://github.com/armory3d/iron
cd win32
git clone --recursive https://github.com/Kode/Kha
cd Kha
git submodule foreach --recursive git pull origin master
git pull origin master

Updating

cd iron
git pull
cd ../armory
git pull
cd ../win32/Kha
git submodule foreach --recursive git pull origin master
git pull origin master

Linux

git clone https://github.com/armory3d/armory
git clone https://github.com/armory3d/iron
cd linux64
git clone --recursive https://github.com/Kode/Kha
cd Kha
git submodule foreach --recursive git pull origin master
git pull origin master

Updating

cd iron
git pull
cd ../armory
git pull
cd ../linux64/Kha
git submodule foreach --recursive git pull origin master
git pull origin master

MacOS

git clone https://github.com/armory3d/armory
git clone https://github.com/armory3d/iron
cd KodeStudio.app/Contents
git clone --recursive https://github.com/Kode/Kha
cd Kha
git submodule foreach --recursive git pull origin master
git pull origin master

Updating

cd iron
git pull
cd ../armory
git pull
cd ../KodeStudio.app/Contents/Kha
git submodule foreach --recursive git pull origin master
git pull origin master

You are now using the latest version of Armory. This may not be stable at all times - in case of issues, revert back to the _backup versions.

Going deeper: