C++ How do you let a program update without redownloading everything?

[Guest]

Typically when you need to update something you need to go redownload the installer and go from there. Some programs have a built in updater that only downloads what is needed as opposed to wasting bandwidth on the whole thing. How does this work?

[as96]

Typically when you need to update something you need to go redownload the installer and go from there. Some programs have a built in updater that only downloads what is needed as opposed to wasting bandwidth on the whole thing. How does this work?

Probably by updating single DLLs

[trag1c]

As @as96 said dll's are probably your best bet. As long as the interface doesn't change you can replace any dll files without updating any binaries dependent on those dll's.