Recently, Steam made it possible to reinstall a demo after you've purchased the full game. Previously, you had to open up the hidden console on the Steam client and input a specific set of commands. Now, you can just click the "Install Demo" button on the store page. That's a lot easier! Thank you, Steam!
As a reminder, here's how cross-play between the demo and full game works:
Is there cross-play between the Demo and Full versions of the game?
Yes and no. While the demo and full game are separate on Steam and cannot play together, if you purchase the full game, the full game's content is also added to your demo. Your demo, now identical to the full game, can join or host games for other demos, allowing you to share the full game's content with your friends.
If I own the full game, what content can I share in demo games?
When selecting tanks, arenas, and game modes, players will only see what they have unlocked. Other players will not have the option to select content from the full game, but you can select it for them.
When playing Campaign Mode, the number of levels depends on the host. If the host owns the full game, players will tackle all 100 levels and bonus levels. If the host does not, then there will only be 30 levels without bonus levels.
If I own the full game, how can I download the demo again?
You can download it from the demo store page.
Still Have Questions?
Cross-play between the demo and full game have a dedicated Steam discussion. That is the best place to get the most up-to-date information and ask questions.