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Make sure you have Java installed. If the jar still doesn't open with Java, use Jarfix.

The installer download should only download a jar file. You need to run the jar file, not extract it.

So.. all you want is to have the vanilla item place both the vertical and horizontal slab based on how its used? Ok. Then just replace the Slab item in the registry. Its a simple process. You control the placing, so the BLOCK itself can be separate blocks, but the item in your inventory is the same.

If you want to add/change HUD elements, subscribe to RenderGameOverlayEvent and render things there. If you want to change an existing GUI, one of the events in GuiScreenEvent should be enough.

I know. That is the reason I want to know that the file he downloaded is the one it should be. I never ever said that I want to automatically download the file. When I said run is just run. The same you do double clicking a file in windows but clicking a button in a page. The first way I though of getting the installer is just to upload through a form but I can find the checksum of the file unless I do a web scraper. The second is to create myself the server and, then let my friend to do whatever he want. Even if I wanted to automatically download the file, I will push the user to the download page and grab the download link in the last step or something like that.

I can't see the part of code which should call registerItemModel from item class. I think, you've missed ModelRegistryEvent. @Mod.EventBusSubscriber public static class RegistrationHandler { // ... @SubscribeEvent public static void registerItems(ModelRegistryEvent event) { ModItems.registerModels(); } }

I am

PS If you don't want to change the build.gradle, you can also use an IntelliJ artifact to copy the resources to the correct folder i.e. from C:\Users\TGG\Documents\JavaSources\HiddenMessages\src\main to C:\Users\TGG\Documents\JavaSources\HiddenMessages\build\classes\main Project Structure ->Artifacts Add new artifact (green +) Type: Other Give it a name eg CopyResources' Output Directory C:\Users\TGG\Documents\JavaSources\HiddenMessages\build\classes\main Add Copy of (green + with small down arrow) Directory: 'resources directory content' C:\Users\TGG\Documents\JavaSources\HiddenMessages\src\main OK to save Then, add the CopyResources artifact to "before launch" on the Run/Debug configurations. eg Run->Edit Configurations->Application->Minecraft Client - add to 'before launch' box at the bottom. -TGG