If you try to drag a Thaumcraft.jar or OptiFine.jar into an Eaglercraft launcher, nothing will happen. Here is why:
To add mods to Eaglercraft, you must use tools and files designed specifically for the Eaglercraft runtime. how to add mods on eaglercraft
This is the easiest and most stable way to modify your game. Resource packs change the look of blocks, items, and the GUI. If you try to drag a Thaumcraft
Step 1: Find a Compatible Pack Eaglercraft runs on versions 1.5.2 or 1.8.8 (depending on which website you play on). You must download a resource pack that matches the version of the Eaglercraft instance you are playing. Most standard 1.8 packs will work on Eaglercraft 1.8.8. To add mods to Eaglercraft, you must use
Step 2: Convert to EPK Format
Eaglercraft does not read standard .zip files the same way desktop Minecraft does. It uses a format called EPK (Eagler Package).
Step 3: Load the Pack
In the Eaglercraft community, the word "mod" is loosely used. Here is what it actually means: