Board Thread:LotR Mod Technical Support/@comment-45.3.12.5-20160521034837/@comment-27324018-20160527175255

Here's the deal. The LOTR mod cannot run on 1 GB of RAM. You say you have 8 GB of RAM on your PC. You cannot access all of it unless you have 64-bit Java. Make sure you do before you change the stack size. Then you should be able to allocate 4 GB of RAM or at least 3. I doubt you need to mess around with MultiMC unless you really want to use different profiles for different mods. As has been said above, you can do "Edit Profile," then change the JVM arguments. Change the argument after "-Xmx" from 1G or 512M or whatever it is to 2G or 3G or whatever you please.