If you downloaded the application from https://quickbooks.intuit.com/download, it should be fine. You can also try using a different browser.
If you’re using Internet Explorer, there may be a setting that’s blocking the application. Take a look at the following steps (see to it that Allow software to run or install […]
Resolution for 'check mark on it again issue: 'Windows 10 App warning of Corrupt or Invalid signature?' available: Yes.
The check mark on it again issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the check mark on it again issue yourself by looking for a resolution described in the article. If it is a complex check mark on it again issue or you are unable to solve the issue, you may contact us by clicking here or by using other check mark on it again support options.
For more information about resolving issues related to check mark on it again in Quickbooks/QBO or to get support for the issue 'Windows 10 App warning of Corrupt or Invalid signature?', click the link below: