This error occurs when the company file being restored is not recognized as a QuickBooks file. The article describes how to resolve this issue.

Provides QuickBooks installation FAQs, including updating and moving data, and information about system requirements.

This article describes how to re-create a damaged EntitlementDataStore.ecml file, which stores license and product code information and can cause errors if damaged.  

Describes how to copy QuickBooks installtion files from CD to hard drive, and how o install QuickBooks from the hard drive.

Information about installing QuickBooks on additional computers. The number of users you purchase licenses for determines the number of computers on which QuickBooks has been installed.

This article contains detailed instructions on how to download and install the QuickBooks Online Backup program.