We have just published a migration guide from 2.12.0 to 2.13.0 of OpenVidu Pro. You can read it here: https://docs.openvidu.io/en/2.13.0/openvidu-pro/deployment/upgrading/
Upgrading from 2.12.0 to 2.13.0 an OpenVidu CE deployment is just as easy as keeping you recordings folder from old installation to the new one (just as this point instructs for OpenVidu Pro). This is of course just necessary if you have used recording feature.
We really recommend our users ti upgrade to the latest 2.13.0 version, as it brings many improvements.