JujuLautre
Deity
First, you must install these mods AFTER updating to 3.19.
Then, make sure that the folder structure is something like ...\Beyond the Sword\Mods\Rhye's and Fall of Civilization\Assets.
If it is ...\Beyond the Sword\Mods\Rhye's and Fall of Civilization\somethingelse\Assets, move everything from somethingelse to the "Rhye's and Fall of Civilization" folder.
Then, make sure that the folder structure is something like ...\Beyond the Sword\Mods\Rhye's and Fall of Civilization\Assets.
If it is ...\Beyond the Sword\Mods\Rhye's and Fall of Civilization\somethingelse\Assets, move everything from somethingelse to the "Rhye's and Fall of Civilization" folder.
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Are u playing on easy level? On Monarch and Emperor it's almost impossible to trade techs even with vassals in later eras. AI just wants 3-4 expensive techs for its one cheap. Or even doesn't want to trade at all.