No module named 'nengo.utils.compat'

[steroal]

Dear Pawel/Travis,
I want to do some experiments with nengo and reinforcement learning.
I followed the readme file to try running the sample.
The following error occurs:
Traceback (most recent call last):
File "rover.py", line 16, in
from rover_vision import RoverVision
File "G:\robot\neurorobotics-2020\rover_demo\rover_vision.py", line 29, in
import nengo_dl
File "F:\anaconda\envs\mujoco\lib\site-packages\nengo_dl_init_.py", line 42, in
from nengo_dl.simulator import Simulator # noqa: F401
File "F:\anaconda\envs\mujoco\lib\site-packages\nengo_dl\simulator.py", line 19, in
from nengo_dl.tensor_graph import TensorGraph
File "F:\anaconda\envs\mujoco\lib\site-packages\nengo_dl\tensor_graph.py", line 14, in
from nengo_dl import builder, graph_optimizer, signals, utils, tensor_node
File "F:\anaconda\envs\mujoco\lib\site-packages\nengo_dl\graph_optimizer.py", line 9, in
from nengo.utils.compat import iteritems
ModuleNotFoundError: No module named 'nengo.utils.compat'

nengo officially says that i need to install nengo==2.8, but nengo-loihi requires Nengo to be >= 3.0
How can I overcome this difficulty?

[steroal]

ps: i do thosething on win10.