From @whichonespink44 on February 28, 2016 14:8

http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/1293792-1-8-1-7-10-forge-ssp-smp-amberoguia-mod-v1-5-adds

Copied from original issue: Team-RTG/1.8.9-Realistic-Terrain-Generation#25

There is no version of Amberoguia for 1.8.9