In the file __init__.py replace
if bpy.context.scene.render.engine not in ["CYCLES", "BLENDER_EEVEE", "BLENDER_WORKBENCH"]:
bpy.context.scene.render.engine = "BLENDER_EEVEE"
with
if bpy.context.scene.render.engine not in ["CYCLES", "BLENDER_EEVEE_NEXT", "BLENDER_WORKBENCH"]:
bpy.context.scene.render.engine = "BLENDER_EEVEE_NEXT"
In the file __init__.py replace
with