To resolve the issue with Spine Editor 3.6 not being able to contact the server, you can try the following steps:

1. Update the Spine Launcher: Since you are using an older version of the Spine launcher, it is recommended to download the latest installer from your license page and reinstall Spine. This will update the launcher, which might resolve the connectivity issue.

2. Check Network Configuration: Ensure that there are no other network configurations, such as a proxy or VPN, that might be interfering with the connection. If possible, try connecting to a different network, such as a mobile hotspot, to see if the issue persists.

3. Review the Hosts File: Check your system's hosts file to ensure there are no entries for esotericsoftware.com that might be blocking access.

4. Examine the Spine Log: Review the spine.log file for any specific error messages that might provide more insight into the issue. The log file is located in the following directories:

   • Windows: <user home folder>\Spine\spine.log
   • Mac: <user home folder>/Library/Application Support/Spine/spine.log
   • Linux: <user home folder>/.spine/spine.log

5. Disable Security Software: Temporarily disable any antivirus or firewall software to see if they are blocking Spine's connection. If disabling them resolves the issue, consider adding an exception for Spine.

By following these steps, you should be able to identify and resolve the issue preventing Spine from contacting the server.

Evan2245 The error is often caused by anti-virus software. Please refer to the “Antivirus and anti-malware” section of the troubleshooting page to add the Spine folder to your safe list:
https://esotericsoftware.com/spine-troubleshooting#Antivirus-and-anti-malware