Minecraft Java Edition 1.12.2 (released September 18, 2017) is a long-term modding hub. Reasons include:
The Fullbright Texture Pack 1.12.2 can be downloaded from various online sources, including [insert links to reputable sources]. To install the pack, follow these steps: fullbright texture pack 1122 link
You can find the official, safe download for version 1.12.2 at the following reputable sites: Minecraft Java Edition 1
If you don't want to use a pack, you can modify your game files directly (works best with OptiFine installed). Close Minecraft. Navigate to your .minecraft folder. Open the options.txt file. Find the line that says gamma:1.0 . Change it to gamma:100.0 (or higher). Save and restart your game. Is Fullbright Allowed? Before you jump into a multiplayer server, Close Minecraft
Once you've found a reliable source, click on the download link. Make sure you select the version compatible with Minecraft 1.12.2.