You have to login to your My Veritas Portal (I believe using an account that has the appropriate license associated with it) in order to download the installer for older BE versions. The current version can always be downloaded as trialware from www.backupexec.com (but this is BE 16 at the time of writing this info and NOT BE 15 so won't help you)
If you are having issues with the My Veritas Portal (including login, locating licenses and/or downloads then please speak to our customer care teams by phone using the the support numbers for your region.
