Hey guys. I've been struggling with using this mod the last few days and finally found a decent way to deal with the spawning issues.

Using the Simple Spawners mod found here: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1295978823 you can add in these spawns using the Custom Spawner.

Use Simple Spawners Tools (after downloading mod):
admincheat scriptcommand simplespawners

Once in the mod, select a "Customer Spawner" to spawn modded dinos. Then, using the wheel, you'll go to "Settings" and add ONE of the following to the "Paste Creature Blueprint" line at a time:

Blueprint'/Game/Mods/AncientWyverns/Dinos/Wyvern/Wyvern_BP_Fireball.Wyvern_BP_Fireball'
Blueprint'/Game/Mods/AncientWyverns/Dinos/Wyvern/Wyvern_BP_Ironbelly.Wyvern_BP_Ironbelly'
Blueprint'/Game/Mods/AncientWyverns/Dinos/Wyvern/Wyvern_BP_Vipertooth.Wyvern_BP_Vipertooth'
Blueprint'/Game/Mods/AncientWyverns/Dinos/Wyvern/Wyvern_BP_Ridgeback.Wyvern_BP_Ridgeback'
Blueprint'/Game/Mods/AncientDragons/Dinos/Dragon/Dragon_BP_Fireball.Dragon_BP_Fireball'
Blueprint'/Game/Mods/AncientDragons/Dinos/Dragon/Dragon_BP_Ironbelly.Dragon_BP_Ironbelly'
Blueprint'/Game/Mods/AncientDragons/Dinos/Dragon/Dragon_BP_Vipertooth.Dragon_BP_Vipertooth'
Blueprint'/Game/Mods/AncientDragons/Dinos/Dragon/Dragon_BP_Ridgeback.Dragon_BP_Ridgeback'

Please feel free to ask questions if you run into issues. Simple Spawners and these command lines have made Ancient Dragons & Wyverns very usable on Valguero.