To do this, create the following folder structure on the FTP:

GameserverID/css/cstrike/addons/sourcemod/plugins

GameserverID/css/cstrike/addons/sourcemod/configs

GameserverID/css/cstrike/addons/sourcemod/translations

The SMX file you have downloaded goes in the plugins folder.

If a plugin configuration file is included, this usually belongs in the configs folder. Depending on the developer, this might have to go in the cstrike/cfg folder. This is always in the plugin instructions!

If a translation file is available (look for *phrases.txt), this file goes in the translation folder.