Board Thread:Oblivion/@comment-184.3.217.182-20141215023946/@comment-6881629-20151110092711

Another mod that might causes problems for the Horse Armor dlc is Oblivion Character Overhaul (athough there is now a version two don't know if thats the same).

Make your the load order is correct 184.3.217.182 used BOSS but LOOT has replaced it.

You will only get the Old Nag if you don't already own a horse, otherwise apart from mod conflict no idea.