Additional software components may be required to run the game on your computer.
Microsoft .NET Framework 4	Microsoft Visual C++ 2010 SP1 Redistributables
Several reasons for launching the client with the MU ONLINE error: Several reasons for launching the client with the MU ONLINE error:

Client Downloads WARMU	Size
Client WARMU ((Mega.nz) - [WinRaR]	832,6 Mb	Download
Anti-Lag_patch_full ((Mega.nz) - [WinRaR]	1.66 MB	Download

If you have problems with the game, make sure you have the latest drivers installed. The following links will help you update your drivers.