Hi,
In your Student Center, you'll find several different versions of the Study Organizer. If you download a version that isn't compatible with your current version of Excel, you'll be required to enter a password. Try checking which version of Excel you have, and make sure to download the matching version.
If you still cannot open the file, please contact our tech department at
techsupport@manhattangmat.com or call us at 800-576-4628 and ask for the tech department.
Best,
Matthew Mapplebeck
Student Services Associate
Manhattan GMAT