Modx revo Can't See Plugins In Core/packages Folder?

Question

CMS

Good afternoon!
Installed modx revo on local web server (freebsd10+apache+mysql+php5.4). I started making settings, trying to add packages and found that I couldn't install plugins. I upload with the "upload" button, I get a message that everything is uploaded normally. But the package list is empty. I uploaded several plugins to the core/packages folder, I click the "search for packages locally" button, the list is empty. In the system logs, I see an error that there is no connection to the package provider:
[2015-04-22 15:52:02] (ERROR @ /connectors/index.php) Could not connect to provider at: rest.modx.com/extras
[2015-04-22 15:52:02] (ERROR @ /connectors/index.php) Could not connect to provider at: rest.modx.com/extras
Because the network does not have an Internet connection for security reasons; in principle, I will never be able to reach the provider. Is there a way to install packages locally? There is access via ssh, there is access to the database. Maybe there is a way to install plugins from the command line or by other methods?