RenicCovenant

I am haveing a simmular issue, i have set up a server on Tekkit, got the server up and running, but when i try to log onto it, it tells me their are 4 mods that im missing to get on the server, i cannot find any way in the launcher to update my mods, i even cleared the cache and made it redownload everything, how can i fix this issue so i can get on the server to play? The Mods are as follows: mod_IC2 v1.103 mod_ComputerCraft 1.41 mod_CCTurtle 1.41 mod_Railcraft 5.4.7