How to update client application files (updater)?

Question

client-server

In short.
I used to use an updater from Lineage 2, outwardly finished to normal.

This is how he looked. Now we need an analogue.
If long.
There is a web server with a directory in which files lie. The client launches the updater and downloads these files to itself, in a certain directory. The updater is also used to launch an executable file from this directory. If the files on the server have been updated, then you need to "download" them and check the rest.

Answer 1

Question removed. I wrote my..