Generally speaking, a QuickBooks error 404 means that the program cannot find a particular file or resource. This issue could come up during installation, updates, or when attempting to use a certain feature. Network problems, faulty installation files, and missing parts are typical culprits. Users can attempt restarting their computer, verifying their internet connection, and reinstalling Quickbooks if required to fix issue 404. Running QuickBooks as an administrator and making sure that any software upgrades are applied are also recommended. If the issue continues, QuickBooks support can help with more complicated problems.