SYMPTOMS
Data from a backup made with Plesk 7.5.6 cannot be restored using Plesk 8.1.1, the following error is displayed:Unable to find certificates.id='1'
RESOLUTION
1. Please download the following filehttp://download1.swsoft.com/Plesk/Autoupdate/Windows/8.1.1/120024/psabackup.dll
2. Place it to %plesk_bin% folder.
3. Try to restore from the backup again