I'm trying to complete the Lightning App Builder Trail, Work with Custom Lightning Components module, and need to download the unmanaged package to complete the hands-on-challenge but I keep getting an insufficient privilages error as per below:

This app can't be installed.
There are problems that prevent this package from being installed.
Insufficient PrivilegesYou do not have the level of access necessary to perform the operation you requested. Please contact the owner of the record or your administrator if access is necessary.

I'm trying to complete the Lightning App Builder Trail, Work with Custom Lightning Components module, and need to download the unmanaged package to complete the hands-on-challenge but I keep getting an insufficient privilages error as per below:

This app can't be installed.
There are problems that prevent this package from being installed.
Insufficient PrivilegesYou do not have the level of access necessary to perform the operation you requested. Please contact the owner of the record or your administrator if access is necessary.