How to install LMP

First of all get the version you want by reading: How to get the latest stable version of LMP or How to get the latest nightly version of LMP

There are four zips available for download: the client and the server, compiled in Debug and in Release configuration. Choose the Release version for each.

Client

Inside the Client zip you will see a folder called GameData. You must put the GameData folder into your main KSP folder ("merge" the two GameData folders).

Server

You only need the server of you want to host your own. You don't need it to simply join a public server or one which a friend has already set up.

1. Inside the Server zip you will see a folder called LMPServer. Put it somewhere like your desktop in order to host LMP games but do not put it in the KSP folder.
2. Follow the instructions in Create a server to complete installation and set up a server.