Lightning Forms documentation: https://help.lightningtools.com/lightning-forms

Installation instructions for SharePoint Online: https://help.lightningtools.com/installation-configuration/installing-lightning-forms
Follow the same process to upgrade.

Installation instructions for SharePoint 2019/SE: https://help.lightningtools.com/installation-configuration/installing-lightning-forms-in-sharepoint-2019\
Follow the same process to upgrade, including running the LTDeploy application.
