Amazon Prime Video on OSMC (Raspberry Pi 2)

I’m still getting a ‘Script failed’ error. I registered with the kodinerds.net forum and downloaded default.py. Replaced the original, and exactly the same error. Can browse titles etc, but when it comes to playing a video it stalls at ‘Script failed’. This is what I see in my logs:

20:25:57 T:1760789536 ERROR: EXCEPTION Thrown (PythonToCppException) : -->Python callback/script returned the following error<–
- NOTE: IGNORING THIS CAN LEAD TO MEMORY LEAKS!
Error Type: <class ‘urllib2.HTTPError’>
Error Contents: HTTP Error 404: Not Found
Traceback (most recent call last):
File “/home/osmc/.kodi/addons/plugin.video.prime_instant/default.py”, line 1082, in
playVideo(url, selectQuality==“true”)
File “/home/osmc/.kodi/addons/plugin.video.prime_instant/default.py”, line 619, in playVideo
flashContent=opener.open(matchSWFUrl[0]).read()
File “/usr/lib/python2.7/urllib2.py”, line 437, in open
response = meth(req, response)
File “/usr/lib/python2.7/urllib2.py”, line 550, in http_response
‘http’, request, response, code, msg, hdrs)
File “/usr/lib/python2.7/urllib2.py”, line 475, in error
return self._call_chain(*args)
File “/usr/lib/python2.7/urllib2.py”, line 409, in _call_chain
result = func(*args)
File “/usr/lib/python2.7/urllib2.py”, line 558, in http_error_default
raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
HTTPError: HTTP Error 404: Not Found
–>End of Python script error report<–

The 404 error seems like the relevant bit. Unfortunately I’m not quite up to the task of fathoming the python script (yet). Has anyone got any ideas?