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At the moment there is no way to hide an effect from the inventory screen.

No! That is not what you do. You tell the server the action the player performed ("Do fancy thing" button was pressed, etc.). Then the server changes something, after verifying that this request makes sense. Treat the client like a lying bastard, do not trust it. For example, do not send "Please add itemstack X to the inventory", because you have now created a loophole for malicious players to spawn infinite amounts of any item they want.

Make sure you have Java installed. If you do and you still cannot run Jar-files by just opening them, you can use Jarfix.

Also note that RLCraft is a 1.12.2 modpack (which is not supported anymore).

1.8 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.