There is no doubt that QuickBooks Error Code 404 is trickier than other QuickBooks errors. It is a service message error that comes up when the QB app is unable to install an update successfully or is unable to make a connection with the Intuit server. There could be few possible reasons to this issue which re underlined below-
QB software is corrupted due to incomplete installation
Windows registry is corrupted due to change in product installation or uninstallation
The system file is infected with virus or malware
However, it can be easily resolved with immediate assistance from the QB technical support team. In case you have any queries, drop us a msg and we will revert you back.
https://www.quickbooksphonenumber.com/blog/to-deal-with-quickbooks-error-code-404/