What python script version are you using?
I've tested the one here in GBATemp and the CDNSP Next found in Discord, and it works with both right now.
Click the "Open log dir" button, look for the directory named like the titleId you tried to download, and enter. Order by modified date, so you see the latest logs. Open them (if they are blank, wait a minute, and open them again). Any errors thrown by python should be there.
The open log button doesn't work, but I found the logs myself:
{"message":"stderr: Traceback (most recent call last):\r\n File \"E:\\CDNSP\\\\CDNSP.py\", line 687, in <module>\r\n sys.exit(main())\r\n File \"E:\\CDNSP\\\\CDNSP.py\", line 660, in main\r\n download_game(tid, ver, tkey, nspRepack=args.repack)\r\n File \"E:\\CDNSP\\\\CDNSP.py\", line 377, in download_game\r\n temp = getName(tid) + \" [\" + tid + \"]\"\r\n File \"E:\\CDNSP\\\\CDNSP.py\", line 177, in getName\r\n r = make_request('GET', url, certificate=ShopNPath)\r\n File \"E:\\CDNSP\\\\CDNSP.py\", line 97, in make_request\r\n r = requests.request(method, url, cert=certificate, headers=reqHd, verify=False, stream=True)\r\n File \"C:\\Python36\\lib\\site-packages\\requests\\api.py\", line 58, in request\r\n return session.request(method=method, url=url, **kwargs)\r\n File \"C:\\Python36\\lib\\site-packages\\requests\\sessions.py\", line 508, in request\r\n resp = self.send(prep, **send_kwargs)\r\n File \"C:\\Python36\\lib\\site-packages\\requests\\sessions.py\", line 618, in send\r\n r = adapter.send(request, **kwargs)\r\n File \"C:\\Python36\\lib\\site-packages\\requests\\adapters.py\", line 407, in send\r\n self.cert_verify(conn, request.url, verify, cert)\r\n File \"C:\\Python36\\lib\\site-packages\\requests\\adapters.py\", line 248, in cert_verify\r\n \"invalid path: {0}\".format(conn.cert_file))\r\nOSError: Could not find the TLS certificate file, invalid path: shopn.pem\r\n","level":"error"}
I have all of those files it's referencing. I got it on /hbg/ a few days ago and it works fine.