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I cant access your site backend. please ublock my IP:
36.83.173.18
FYI:
you need to upgrade the site by using ijoomla installer or joomla extensions manager, you cant overwriting with FTP. because the database will not updated.
Before i updated from 4.1.7 to 4.2.0 i installed iJoomla installer but it did not work (error message) so i uninstalled it again.So I installed 4.2.0 with the normal joomla installer.
I tried also to install the update from 4.2.0 to 4.2.1 with joomla installer but I responded with ( no XML file found ). It is a little confusing when to unzip first or not.
So if you would be nice to install the iJommla installer ( if this is easier to use with comming updates) I would be happy