-What i've done by duplicating a copy of your Maplestory folder onto you desktop is to prevent any accidentally updates by clicking on GMS launcher and updating your client to a version that isn't compatible with OdinMS cause GMS launcher is located in X:\Nexon\Maplestory so it will not affect anything in X:\Desktop\Maplestory so you can play OdinMS as normal even though GMS updates
[Optional]Fourth Step : Rename the Maplestory that you have copied onto your desktop as OdinMS.
Fifth Step : Unzip the latest OdinMS launcher to x:\Desktop\Maplestory
------------DOWNLOAD WINRAR AT
www.rarlab.com to unzip the OdinMS launcher compressed in .rar format----------------
[Optional]Sixth Step : To facilitate better and opening the client fast create a shortcut from the OdinMS.exe launcher in your x:\Desktop\Maplestory\OdinMS.exe to the desktop this allow you to go into game without actually opening the Maplestory folder on your client ( Thanks omsBOY, i left out this point )
That should solve people that have the ijl15.dll error