You have installed!. The code for SQLDeveloper does not have an installer.
If the software is on S, say a shared drive, each user will start sqldeveloper and a directory called sqldeveloper will be created in their local %APPLICATION_DATA% folder. This will keep all connections etc unique for all users.
You will have to create a link from the S drive to the sqldeveloper.exe if you want a shortcut to start it. We dont provide it.