Quickbooks Enterprise 2021( Data Compatibility Issue)

Your company file is outdated, so you'll need to gradually upgrade it to reach the latest version. I'm here to guide you through this process and help resolve the error -6094,0, Faizan.

QuickBooks Desktop operates on a 3-year upgrade cycle, which means you'll need to move from 2008 to 2011 to 2014 to 2017 to 2020 to upgrade QBDT Enterprise and then restore the file in between. This is one of the reasons why you're getting the error. To resolve this, you can go to a third-party merchant if you want to download outdated versions in QuickBooks.

Also, the "-6094,0" error commonly occurs due to the interference of certain anti-virus programs, such as PC Tools Internet Security, AVG Anti-Virus, and SpyHunter Malware, which can block QuickBooks from functioning properly. Let's perform troubleshooting steps to fix the issue, Faizan.

I've added them below:
 

1. Make sure your anti-virus software is up-to-date.
2. Restore the qbdmgr.exe and qbdmgrN.exe files from the virus vault or quarantine.
3. Add an exception for the QuickBooks Desktop Directory in your anti-virus software settings to prevent it from being scanned.
4. Repair QuickBooks Desktop.
    

For more detailed guidance on how to check if specific QuickBooks files are being quarantined by your anti-virus software and how to add exceptions for QuickBooks in your anti-virus program, you can refer to the following article: Error -6094, 0 (6010, 2) An Error Occurred When QuickBooks Tried to Start the Database.

Furthermore, to learn how to get started using with QuickBooks Desktop. This will show you how a step-by-step process for setting up your customers, vendors, items, and financial accounts. Read this for reference: Get Started with QuickBooks Desktop.

If you have questions or concerns about the error or while upgrading from QuickBooks Desktop Enterprise, please let us know so we can help you. We'll always be here to assist you further. Have a nice day ahead!

@FaizanNaseem 

I am not sure you can upgrade your company file from QB Desktop 2008 to 2021 in one jump. You should contact @Fiat Lux - ASIA for assistance.