If you’ve purchased SSH Config Editor after 1st May 2020, you are eligible for a free upgrade to version 2.0. Others get a 50% discount for upgrade.

Upgrade SSH Config Editor to version 2.0
Version 2.0 requires macOS 10.15+ if you use older system use version 1.13.3
Choose one of the options:
You can purchase the new version from application itself.
You can download it and try before buy.
Licence Recovery
Upgrade