Restoring R1soft backups

 R1soft is a widely used software for taking Cpanel / WHM/ hosting account backups,  but in the last 2 months ,  it has  not been possible for me to directly restore the backups.

Even after providing the Cpanel password as passphrase, I am unable to access the backups  and  I get the following message, so effectively I have to look for another backup solution.

Unable to restore r1soft backup

The support team of the webhosting company has been able to restore backups.  This has happened for hosting accounts with at least 10 different webhosting companies.