Updating game to all PCs

Hello, I am wondering how to update your game to ALL computers when you build the game. I use Unity 5.5b free

Thanks,

You can write a script that copies the final build to new machines and have it triggered by Unity after the build finishes in build post processing.

There is no built-in way to do that distribution for you.

Ok, what is the script?

Well, that is up to you. You can invoke whatever in post-processing of a build, a C# or a bash script or whatever else.
And then just make that script copy the files to wherever you need them to be.