No it is not possible
Only via upload package or via package server.
Is that possible at all?
Everything the system does could also be done manually. But nobody ever did that and you also should never try.
Please use the update via updateserver or package upload. 
Everything the system does could also be done manually. But nobody ever did that and you also should never try.
Please use the update via updateserver or package upload.
But I want to do it. I mean to learn it and maybe being used for a rainy day.
In the tar packages I couldn't find any update files (like upgrade.php in vBulletin, XenForo and IPS).
I mean is it enough to replace all the files of WCFSetup.tar.gz/install/files into the root directory? And the system recognizes the new version to update tables?
I eagerly want to know and learn.
Thanks a bunch
No, Just don't do it.
It will surely break your installation.
No, Just don't do it.
It will surely break your installation.
When something is automatically done, surely it can be manually done too.
So I figured out "there exists a way" that you and gn5VmUKCtv6ekrMf have mentioned.
Let me know and try
But why would you wanna do that?
It's like manually updating an Android application - you don't do it and just use the Play-Store or a .apk-file.
But why would you wanna do that?
Curiosity!
It's like manually updating an Android application - you don't do it and just use the Play-Store or a .apk-file.
It's like updating WP. You can either manually by replacing WP files into root directory, or automatically update/upgrade your WordPress blog.
Everyone knows automatic way, but no one knows the manual one.
.tar-archives contain way more than just the PHP files.
If you execute .sql files directly and don't use the installer, you will have a problem when uninstalling the plugin.
Installing/updating package plugins is even harder.
But hey, go for it 
When something is automatically done, surely it can be manually done too.
No, it can't, the upgrade process is much more advanced and any attempt to randomly copy files over will break pretty much everything. There is no manual installation of the software and there is no manual update, everything is built around the package system, thus allowing updates without touching the files or database yourself.
Why it's not simple to upgrade manually? As many CMSs have manual way to do so, and some also automatically.
Why would you want to do something manually, when a single button click is all that takes it? There are so many drawbacks to manual updates, it doesn't make sense to ask for it, just because this was a thing decades ago.
The point is, you cannot perform a manual update with our software, because it isn't just a stupid dump files here + run a sql file. The actual instructions and data exists in XML files that define a "this is how its meant to be"-state and the package system will examine each and make the required changes.
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