yes this thread was dead, but i also have this issue with this content: https://www.unrealengine/marketplace/force-field-system
one blueprint and one bpinterface won’t load into version 4.8. they were saved in 4.9 and then upped. placing them into my content folders won’t work, because unreal 4.8 cannot read them. dragging them from the folders into the enginge content browser gives me the above descrived error “…Unknown uasset extension…”
does anyone have an idea how to solve this? current plan is to download 4.9 to get it open, then copy all contents of the blueprints into a new blueprint in 4.8…but my download takes ages…sigh 