Full __full__bright Texture Pack 1.8.8 Access
This is the million-dollar question. Using a exists in a grey area.
Because 1.8.8 is older, some modern packs won't work. Always ensure the pack explicitly states it is for 1.8.X or 1.8.8 . If a pack is for 1.16+, it will likely fail to load. fullbright texture pack 1.8.8
Packaging & user notes