cannot upgrade plugins or install plugins after changing host.

Hi,

I moved my wordpress host from one provider to another provider and many off problems happened after they restored my full backup. I resolved as many of them as I could but one problem is really hard to resolve. I should include that WP in deployed into the root of my website and when I navigate to sarahdom.me or my domain name, my weblog is shown.

Assuming that I want to upgrade the Akismet to its latest version:

– After I select the plugin for upgrade it asks me for a FTP username and password, I create two username password set to use. For each one of them, I get an error which I included.

user: [email protected] and its default directory is set to /public_html

In case I use the above username, password and my frp hostname during the upgrade. It works for some minutes and then shows and error message like the following one:

Enabling Maintenance mode…

Updating Plugin Akismet (1/1)
Downloading update from https://downloads.www.ads-software.com/plugin/akismet.2.5.1.zip…
Unpacking the update…
An error occured while updating Akismet: Could not create directory. /wp-content.

All updates have been completed.

The other user I created is like

user: sarahdom and its default directory is /

the following one and when I enter this user during pluign upgrade, I get the error message I included below.

Enabling Maintenance mode…

Updating Plugin Akismet (1/1)
Downloading update from https://downloads.www.ads-software.com/plugin/akismet.2.5.1.zip…
Unpacking the update…
An error occured while updating Akismet: Could not create directory. /public_html.

All updates have been completed.

Any comment on how to solve the problem is very welcome. Maybe I need to provide the username and password is some configuration files or maybe I should change the default directories. Whatever is the reason and the solution, I cannot find it.