The site you are member of doesn't allow site members to download a copy of the tree.
If you would like to get a copy of the tree, contact your Site Manager and he or she can do it for you.
The email address which is listed as the Site Manager of this site http://sallee.myheritage.com is not the email you are currently registered with.
You'll need to log in with the email address you used to create the account in order to be able to export the GEDCOM file.