Oof, that thread wasn’t as much of a discussion as it was me embarassing myself two years ago.
@EmeraldSlash I believe OP’s issue is that Roblox uses orange-colored normal maps that are incompatible with programs like Blender, which uses blue normal maps. He wants to know if Roblox has blue (uncompressed) variants of the game’s normal maps which he could use.
I personally think DejaVu_Loop’s method (converting orange to blue) is fine for OP though. It might put a dent in precision but the gist of the map still looks decent. Even if it converted it perfectly, a 1024p normal map can’t really provide that much detail up close.
If you want to spice up your renders i highly recommend ditching Roblox materials and getting some PBR textures online. CC0Textures.com currently provides 8 different brick materials, all PBR ready and up to 10k in resolution. Plus, tthey all have a CC0 license!