No problem. If, as you say, it's FW v3.1.0 that's good as it means you can execute the following bit of code in the console tab of the browser's developer tools to find out what was used to create the course:
require('core/js/adapt').build.toJSON();
The part you're interested in is the plugins section:
You need to make sure you can get hold of all the plugin that are listed - not to mention the specific versions of them.
Assuming you can, it should be pretty easy to recreate this.
Start by creating a new course using the Adapt CLI to check out FW v3.1.0
Then you need to make a decision as to whether you use the latest compatible version of the core plugins (which the Adapt CLI will have downloaded by default) - or you go with the versions that were actually used to build the course, possibly upgrading them later.
Then you'll need to install any 3rd party plugins, with the same decision to make around which version to use.
Finally delete the contents of src/course and replace them with the contents of the course folder from the SCORM .zip you have - then you should be ready to go.