What you call a SCORM package is in fact web content that can communicate to an LMS using the SCORM API. You can’t edit or reverse-engineer a published course; however, most SCORM courses are created with authoring tools like iSpring Suite, and use source (project) files that contain all the content, including text, images, video, and more. If you have a project file, you can open it right in the authoring tool, make the necessary changes, and publish the course as a SCORM package.