Paid games on the Steam platform must be purchased from agent retailers and activated on the Steam platform, or purchased online through the Steam platform. After you get the serial number of the game (generally, you will get the game directly after you buy it), you can have the right to download, install and use it (the account will be permanently bound after the game is activated, and any computer can download it as long as it logs into an account with the right to use it).
The Steam client needs to be updated to the latest version to get a better gaming experience. All updates (including games) of the Steam platform are automatic.
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After buying the game on Steam, it will be displayed in the game library of Steam client, and you can choose to download and install it. If it is an activation code purchase, click "Add Game" in the lower left corner of the Steam platform interface, select "Activate Product" and enter the game serial number.
Select "Settings" in the "View" option of the Steam interface, and then click "Download Classification" to set the download area. In China, you can choose American download area and domestic download area. Generally, the download area in the United States is very fast, and it can also be used in China. As long as the network is stable and there is no interference, the download servers of Steam are basically at full speed.
You can also choose to download the game source files with Thunder (which must be read by Steam) and then put the game files in the steamapps folder to verify the integrity of the game files. This method is more suitable for people with poor network environment.