About the 5.6 update

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Could anyone explain something to me about the update ...
I'm getting lost with all those duplicated folders. Some things are taken from the "updates" folder other from the other ... files are duplicated, taking some more space on the server ...
On another thread I was told that i absolutly should not be doing anything within the updates folder, but as a matter of fact I did have to upload things there like the form controller that would not be taken into account if not changed in this folder.
How does that work ? Many thanks

 
JohntheFish replied on at Permalink Reply
JohntheFish
Every version upgrade has its own update sub-folder. Each update sub-folder contains a complete c5 version.

As c5 initialises on each web request, it works out which update folder to load the c5 core from according to config/site.php.

Which is just one of the good reasons why if you want to change anything in the core you should use an override as per:

http://www.concrete5.org/documentation/how-tos/developers/change-th...
ptityop replied on at Permalink Reply
so why some files get fetched from the update folder and others from the older version folder ? I don't get it ... why c5 is taking the page_controls_header from the update not the other one, and I can't override it from the old folder ?