Can someone reply why quickbooks online application doesn't open on macbook? i have tried several time to uninstall and download from settings page from browser.

Hi there, rjaditya. Allow me to share some insights about this matter.

Intuit has stopped updating the QuickBooks Online App for Mac after April 20, 2021. You can still use the app as long your browser supports it. However, even if the QuickBooks Online Mac app continues to work, we still recommend that you switch entirely to a web browser since Intuit won't be fixing any security vulnerabilities moving forward.

In addition to that, only QuickBooks Online Advance and Accountant versions have a desktop app. If you have the versions mentioned, you'll need to manually download and install the QuickBooks Desktop for MacBook. Before downloading the new app, ensure to quit all QuickBooks apps and QuickView from running.

To download, here's how: 

1. Follow this Download link to download the new QuickBooks app for Mac.
2. Follow the instructions on the download page.
3. If you see this message, An older item named "QuickBooks" already exists in this location. Do you want to replace it with the newer one you're moving to, just click Replace. 

After that, launch the new QuickBooks app for Mac by following the steps below: 

.

1. Go to the Finder icon on the bottom left corner of your Mac and click the Applications folder. 
2. Select Always Allow if this message pops up: QuickBooks wants to use your confidential information stored in Intuit ID... in your keychain. This is simply macOS validating the new application.
3. Follow the on-screen instructions. 

For more information, see this link: Install the QuickBooks Online for Mac app.

I'm still with you if you have other questions about QuickBooks Online or the app. Just reply here, and I'll respond as soon as possible. Keep safe!