I can not able to download sample file to import customer it is showing error like404 Not Foundnginx?

Thanks for getting in touch with us on this matter, Rama-techno-pvt. Let me ensure that you receive the appropriate help. 

The error 404 usually appears when the web page you're trying to reach cannot be found on the server. Rest assured, I got some troubleshooting steps to isolate and fix this issue.

First,  let's check if this is a browser-related issue. We can start by opening your account in a private window as it ignores historical data. 

These are the keyboard shortcuts:

• Mozilla Firefox: CTRL + Shift + P
• Microsoft Edge: CTRL + Shift + N
• Google Chrome: CTRL + Shift + N
• Safari: Command + Shift + N

If the error is fixed after this, then the issue is likely caused by your browser. You'll want to clear your regular browser cache. If the issue persists, you may need to use another supported browser.

For future reference, refer to this article if you want to import a list of your products and services from Excel, CSV, or Google Sheets to QuickBooks Online: Import products and services into QuickBooks Online.

I'll be on the lookout in the comment section if you have more questions on error 404 and any QuickBooks-related concerns. We're always available to assist you. Keep safe!