We have a problem with the latest build and TLS, can you please try the following:
1. Go to: C:\Program Files\Synergy\OpenSSL
2. Copy all the files in it.
3. Paste the files in C:\Program Files\Synergy
4. Stop Synergy quit the application.
5. Start Synergy and open Settings.
6. Disable/Enable TLS, it should be able to work now.