Hi, guys! I am Alex Poter, a QuickBooks specialist.
Generally, QuickBooks update error 404 occurs when the software itself fails to sync with the Intuit Server. It is mainly browser-related issues.
Steps to Fix QuickBooks update error 404
Firstly, open your account using a private browser. Shortcut keys for
Google Chrome, Press CTRL + Shift + N
Mozilla Firefox: Press CTRL + Shift + P
Internet Explorer: Press CTRL + Shift + P
If it is working fine, open account settings and clear the browser’s cache file.
If you still face any doubts you can simply make a call to QuickBooks Phone Number at +1-520-463-7633