I highly recommend you use LOOT to sort your load order it is quite easy to use.
My mod has to be in the correct load order. If you do not have Dawnguard or still need help, check with TMPhoenix for troubleshooting. Then you need to make sure NMM/LOOT has placed the mods in the correct load order.' - TMPhoenix Then do your clean save, then re-install Better Vampires and then re-install RaceCompatibility mod WITH the Better Vampire option. 'If you need to do a clean save for Better Vampires, you don't need to remove the RaceCompatibility mod, you NEED to make sure you re-install it WITHOUT the Better Vampires option.