Step 1
Follow the link https://steamcommunity.com/sharedfiles/filedetails/id=2468947502&searchtext=Roshan+Defense+Reborn
Step 2
Go to your Steam account or register
Step 3
Click "Subscribe"
Step 4
Launch Dota and go to the "Game Library" tab
Step 5
Go to the "Library" section
Step 6
Click on the game icon
Step 7
Click on the "play" button. You are awesome!
You can also find the game in the game library by typing “Roshan defense” into the search field
