Internet connection is not available 1min Internet connection is available

VDownloader Plus version 4.5.3407.0 on Windows 10 Pro, keeps switching form Internet connection not available to Internet connection available.  I have disabled Windows Firewall and all antivirus software, and the above still happens every one sec the switches.   I just pay for it and if this cannot be resolved, would like a refund.   I cannot be a Computer, Cable Modem or router issue, as I do not have this issue with Outlook, Steam, Blizzard or Bethesda Games.  The only application having issue with the Internet is VDownloader, YouTube videos always changes it from available to not available.

If it just sets there is shows Internet connection is available, as soon as you try to download any video it goes to Internet connection is not available and This Video is Unavailable.

5/21/2020 12:26:27 PM Internet connection is available

5/21/2020 12:26:27 PM Internet connection is not available

5/21/2020 12:21:24 PM Internet connection is available

5/21/2020 12:21:24 PM Internet connection is not available

5/21/2020 12:21:08 PM Internet connection is available

5/21/2020 12:21:08 PM Internet connection is not available

5/21/2020 12:21:24 PM Internet connection is available

5/21/2020 12:21:24 PM Internet connection is not available

5/21/2020 12:20:52 PM Internet connection is available

5/21/2020 12:20:48 PM Internet connection is not available

5/21/2020 12:20:48 PM Internet connection is available

5/21/2020 12:20:27 PM Internet connection is not available

5/21/2020 12:20:27 PM Internet connection is available

5/21/2020 12:16:55 PM Internet connection is not available

5/21/2020 12:16:46 PM Internet connection is available

5/21/2020 12:16:37 PM VDownloader started