i share in this issue. the root cause is because https://omgwtfnzbs.org
changed to https://omgwtfnzbs.me
but I cannot find a way to update sickbeard to reference the new URL (even in the manual config file).
What I did to workaround the issue is update the local windows hosts file to forcefully use the IP of omgwtfnzbs.me instead and this seems to be working. Add relevant entries to the resolution of *.omgwtfnzbs.me and it should work. I'm listing the entries/IPs below but I recommend you double check the resolution IP to ensure their still valid whenever you read this post.
Open notepad as administrator
add these lines:
Save, no reboot is needed.