Hi,

You can use the odoo community apps in your server by using following steps

1.Create a new folder in you odoo directory

2.Copy the apps you downloaded from odoo apps to new created folder

3.Add the path of new directory in odoo configuration file along with the default addons path

4.Restart odoo service

5.In Odoo Go to Settings->General settings->Activate Developer mode

6.Take App menu ->Update App list and then you can see the modules we have added to our custom addon path.

For reference

https://www.cybrosys.com/blog/how-to-install-custom-modules-in-odoo

Hope it helps