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Thanks for answer. It looks like the mod they are using was not updated for forge > 1.8.

My daughter will attend programming class with Minecraft LUA. Since she missed first two classes I wanted to show her how things look like. I got instructions from organizers and installed Minecraft and latest Forge (as asked by organizers). However, before installing mod instruction required me to start minecraft and then close it. When I did so I got exception "Missing required option(s) ['userProperties']". Is it caused by using demo version or something else? Thanks Excerpt from log Preparing to launch minecraft client for 1.7.10-Forge10.13.4.1614-1.7.10 many Couldn't fetch SHA1 checksums Checking installations. Minecraft client 1.7.10-Forge10.13.4.1614-1.7.10 is ready to start. Starting! Using default game log configuration client-1.7.xml (outputs XML) Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker Forge Mod Loader version 7.99.40.1614 for Minecraft 1.7.10 loading Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_51, running on Windows 10:amd64:10.0, installed at C:\Program Files (x86)\Minecraft Launcher\runtime\jre-x64 Launching wrapped minecraft {net.minecraft.client.main.Main} Unable to launch java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) at net.minecraft.launchwrapper.Launch.main(Launch.java:28) Caused by: joptsimple.MissingRequiredOptionException: Missing required option(s) ['userProperties'] at joptsimple.OptionParser.ensureRequiredOptions(OptionParser.java:447) at joptsimple.OptionParser.parse(OptionParser.java:437) at net.minecraft.client.main.Main.main(SourceFile:83) ... 6 more [java.lang.Throwable$WrappedPrintStream:println:748]: cpw.mods.fml.relauncher.FMLSecurityManager$ExitTrappedException [java.lang.Throwable$WrappedPrintStream:println:748]: at cpw.mods.fml.relauncher.FMLSecurityManager.checkPermission(FMLSecurityManager.java:25) Edit: version 1.7.10 was recommended by organizer (as they use it during classes) and mod I should install is for 1.7.10 as well