How to update from 3.2.16 to 3.4.0 ?

[jimmy2]

...or any other upgrade?
i cant figure out how to use the ftp program to sync the files - i tried to do it as it shows in the 'manual', but it did not update the version number in the backend, although i was able to update the database with the installation tool?
the check tool does show a lot of red line though:

You cannot use the Live Update.
You cannot use the Composer package manager.
The PHP Phar extension is not enabled.
The PHP flag "allow_url_fopen" is not set.
The PHP function "shell_exec" is not available.
The PHP function "proc_open" is not available.

but does that affect the version number in any way and could i downupgrade to 3.3.7 also now?-.- just to see if that works... maybe its just best to overwrite all the files via ftp, not to sync them?

[xchs]

but does that affect the version number in any way

No. Contao reads the version number from the "system/config/constants.php" file:

define('VERSION', '3.4');
define('BUILD', '0'); 

That said, if the Contao back end still shows an old or wrong version number, you would have to check the installation whether all files have been transferrd/overwritten successfully. So, I would suggest to validate the installation with the Contao check tool.