What I basically do is to calc CRC-32 for all the files and download a list of server files and their CRC-32 value to check for modified/missing files. Then I use HTTP to download them. HTTP is great, since you can place the file on a regular Web server instead of a custom server. FTP can be bad, as people can deduct your login/password from scanning your executable.
How exactly would I make a game file updater?
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