Cannot find an OLD Gravity Form on an OLD Word Press site [closed]

It would seem that there should be a Gravity Forms in your plugin folder, assuming it’s not part of a theme.

You could try installing the latest version of Gravity Forms plugin via Add Plugins, and see if you can then get into editing the forms. There should be an entry on the Settings menu (assuming you are admin-level).

Or, it could be that the access level for editing forms is set wrongly. I’d check to see if it exists in the plugins folder, install it if it doesn’t, and go from there.

If there is a compatibility issue between the latest version and your WP version, then you could go to the Development area of the plugin (via the plugin page) and try downloading/installing an older version.