Updater/Patcher for game client

Hello!
Help please, I want to write the updater application to Unity, but I do not know how to do so only changed part, but not all customer completely. I can fully replace the client, but it is not very rational when changes only 0,5 MB.

Use asset bundles.

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I do not wand use assets. I want to do it myself. I know how, but have problems with the packaging build in Unity.

Oh, I’m sorry, i don’t sleep 3 days, first did not understand.

Thank you!

There is an option for Indie version?

No, it’s a Pro option.