1. Please go to Spectrum OneClick server, open $SPECROOT\tomcat\conf\server.xml file.
2. Find the "Connector" session in the file, replace sslProtocol="TLS" with sslEnabledProtocols="TLSv1,TLSv1.1,TLSv1.2,SSLv2Hello,SSLv3".
3. Below is what it should look like after you make the change for the "Connector" session.
4. Please restart Spectrum tomcat service.
5. Run the installation for Spectrum connector again.