How to restore an old backup - db schema ver 5 gyb expects ver 6

[devt384]

Hi,
I have installed gyb 1.62 on a Linux server. The email backup was done some time ago using "gyb-alpha-16-windows".
After installing gyb on the linux server I enter the restore command:
$ gyb --action restore --email dev****@gmail.com --local-folder /home/seadmin/google_backup/dev*****gmailbackup/ --label-restored dev****-v1-20121226

But eventually get:
"Sorry, this backup folder was created with version 5 of the database schema while GYB 1.62 requires version 6 - 6 for restores"

Any ideas how I can restore the backup? Is it possible to upgrade the backed up database from version 5 to version 6?
Thanks Dev