Cant update herlink to beta channel

HereLink
1 
dear cubepilot staff

i cant update herlink to beta channel (Remot unit)

PS C:\Users\Mohammad\Desktop> .\flasher_win.exe beta
Looking for Device
Found Unit Type: remoteunit

Downloading required package...
Traceback (most recent call last):
  File "site-packages\urlgrabber-4.1.0-py3.8.egg\urlgrabber\grabber.py", line 1583, in _do_perform
pycurl.error: (22, 'The requested URL returned error: 404 ')

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "flasher.py", line 266, in <module>
  File "flasher.py", line 74, in download_package
  File "site-packages\urlgrabber-4.1.0-py3.8.egg\urlgrabber\grabber.py", line 828, in urlread
  File "site-packages\urlgrabber-4.1.0-py3.8.egg\urlgrabber\grabber.py", line 1298, in urlread
  File "site-packages\urlgrabber-4.1.0-py3.8.egg\urlgrabber\grabber.py", line 1170, in _retry
  File "site-packages\urlgrabber-4.1.0-py3.8.egg\urlgrabber\grabber.py", line 1148, in _retry
  File "site-packages\urlgrabber-4.1.0-py3.8.egg\urlgrabber\grabber.py", line 1281, in retryfunc
  File "site-packages\urlgrabber-4.1.0-py3.8.egg\urlgrabber\grabber.py", line 1346, in __init__
  File "site-packages\urlgrabber-4.1.0-py3.8.egg\urlgrabber\grabber.py", line 1695, in _do_open
  File "site-packages\urlgrabber-4.1.0-py3.8.egg\urlgrabber\grabber.py", line 1833, in _do_grab
  File "site-packages\urlgrabber-4.1.0-py3.8.egg\urlgrabber\grabber.py", line 1829, in _do_grab
  File "site-packages\urlgrabber-4.1.0-py3.8.egg\urlgrabber\grabber.py", line 1678, in _do_perform
urlgrabber.grabber.URLGrabError: [Errno 14] HTTPS Error 404 - Not Found
[6544] Failed to execute script flasher
PS C:\Users\Mohammad\Desktop>
2

Please register as beta with the “Register as beta channel” in System Updates in the controller.

3

How do I register?

4

There is a “register as beta channel” button at the left-bottom side in System Update screen.