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If you get the error manifest file not found when you are adding scorm modules, check the upload_max_filesize setting in your php configuration.
It will most likely be 2M which means that you can only add files of 2mb
In the administrator folder add the following line to your php.ini
upload_max_filesize = 10M
This will allow you to upload a 10mb scorm module.
If php.ini files don't work on your server, then contact your hosting service to change this setting or use the appropriate commands in the .htaccess file.