Installation Error:Tribon conflicted with Python3.8?

[sam2016]

@snippsat
Dear snippsat:

I tried another way that python3.8 can run well. That was:
-Removed "PYTHONPATH" from my environment variable;
-Running python3.8 and IDLE, running well.
-Tribon's secondary development software can not be started.

When I added “PYTHONPATH” into environment variable. Tribon running well, but python3.8 can not be running.

So, Is there any idea for running Tribon and python3.8 well?

Thanks for your help in advance!