Recently, I had to install multiple FTP deployers on the same server for testing purposes.
In order to achieve this, I needed to install several Content Deployers as Windows Services, by performing these steps:
Create a new config folder in your desired location, i.e: C:\MyNewDeployer\config.
In this new location, add your configuration files: cd_deployer_conf.xml, cd_storage_conf.xml, cd_licenses.xml, logback.xml.
You won't need to have a lib folder present, as the deployer will first check the tridion_home\lib folder.
To allow that each deployer uses its own temporary folder, ensure that each cd_storage_conf.xml is pointing to a different temporary location, by adding the TempFileSystemTransactionLocation attribute in the Storages element, as follows:
Open a command-prompt window and navigate to your tridion_home\bin folder;
Run the command: cd_deployer.exe -install "My Deployer" -configLocation=C:\MyNewDeployer\config"
You should then see a similar output to the one below:
If you now navigate to the Services, you will see the newly created Deployer:
Note: If, for some reason, you need to delete the newly created deployer, you can achieve this by running this command from your Tridion_home\bin folder:
cd_deployer.exe -remove "My Deployer"