Unable to use old settings on an update


My Teamspeak3 server hosted on a server at my home had crashed (I was unable to start it). So I thought maybe there was an update. So I download and install the latest version (unzip and copy / paste directly into the Teamspeak3 folder keeping the old folders, copied for security, in another folder).
When I launch Teamspeak, the window of a very fresh installation appears as if I had lost the settings.
I backed up the files:

How do I recover my server? Thank you for your help.

I read this post:

Somethings are missing (I never seen this files before):

2 posts were merged into an existing topic: Backup your server instance or migrate onto a new location