Thanks for being a member of the QuickBooks Desktop family. Keeping your software up to date is important for your business. I'll be happy to help you get back up and running. The error you mentioned is related to internet connection issues. Check this community article for detailed steps on how to fix QuickBooks Desktop Update Errors: https://quickbooks.intuit.com/community/Help-Articles/Fix-QuickBooks-Desktop-Update-Errors/m-p/26168....
If you need any further assistance with your QuickBooks Desktop updates, you can call our support line at 1-877-772-9158. Pro and Premier support is available 24 hours and Enterprise support is available from 9 a.m. to 8 p.m. EST, Monday to Friday.
Reach out if you have any other questions.