Upload old version of wordpress

Hi, i was working on a web site when afther updating a lot of staff was not working, ecc. so i took the backup i do before to update and re-upload but the problem is in the website there is same strange code cause from apple.quarantine.com (check http://www.misterbrickimmobiliare.it/wp-admin/ ) so i follow the debug to do with the terminal on my mac and i re-upload everithing back but still the error.
So i try to see if in localhost was giving the same error, but actually on local was working fine the website without the strange code.
I see that in the strange code there was write also Cyberduck, so i re-upload with file zilla but the problem still there.
Any suggestion ? Sorry for my bad english but i’m Italian.
The web site is http://www.misterbrickimmobiliare.it/