Purchase and download the game "Bloons Tower Defense 5" to play on a PC or Mac by visiting SteamPowered.com. Alternatively, download the game for an iOS device from the Apple App store, or for an Android device from either the Google Play store or the Amazon Appstore for Android.
To download "Bloons Tower Defense 5" from the Steam store, first sign up for a free Steam account. After verifying the account, download and install the Steam client, which is necessary to manage and play the game. It is possible to purchase the game either from the store section of the client program or through the online store. The purchase process also includes the option to immediately download and install the game or save the download for a later date. To play the game, launch the Steam client and click the Launch button from its entry under the Library tab.
To download the game on an iOS device, visit the App Store on the device on you wish to play the game and click on the button that includes the price of the game. It is also possible to download the game on a computer through the App Store website, which launches iTunes on the computer. Similarly, you can download the game on the Google Play or Amazon Android store either through the app on the device or on the store website.