The three common reasons why you might be facing QuickBooks Error 15240 are listed below.
And if you haven’t logged into your software using the admin credentials- then also the same code of error can flash on your screen.
Lastly, the reason for your error can be a damaged, corrupted, or infected Windows Registry. So make sure you have checked all of it.
If you have kept the shared download on active mode but the specified download link happens to be incorrect- this also becomes a reason for this issue.
And to fix this you can use any of these solutions.
Checking the IE settings properly.
Correcting the date and time settings on your device if it is wrong.
Try to use the administrator account of Quickbooks.
Using the Tool Hub for the solution
You may additionally learn:-How to fix QuickBooks Error Code 12152