Hello, i have tryed everything that you told me and didnt fix the problem.
My hosting provider told me that your servers are not on black list, and they put it in whitelist just in case.
I have tryed to update theme manualy but got problem like this:
Unpacking the package…
Installing the plugin…
The package could not be installed. No valid plugins were found.
Plugin installation failed.
So here is FTP informations that you asked.
Thank you in advance…