QB Issue Resolution:

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 even if the signature is invalid is checked):

  1. Open Internet Explorer.
  2. On the menu bar, click Tools and select Internet Options.
  3. In the Internet Options window, go to the Advanced tab.
  4. Scroll down and check Allow software to run or install even if the signature is invalid. (If it is already checked, toggle it: Remove the check mark and click OK to save it. Start again at step one. When you reach step four, put a check mark on it again.)
  5. Click OK to save the settings.
  6. Close the Internet Options window, and close and re-open Internet Explorer.

Try downloading the application again. If it doesn’t work, please try using Chrome.

Resolution for Issue 'Windows 10 App warning of Corrupt or Invalid signature?' available: Yes (Solved).
Source: Intuit Community forum.

Windows 10 App warning of Corrupt or Invalid signature?: this 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 issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for App warning of Corrupt
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