Unable To Install Data Updates – Quickmap Data Download Manager

Posted on February 7, 2024 by Webmaster

When clicking Install Now on Quickmap Data Download Manager V8.4.8622.20335, you may get this error:

Unable to install data updates

Unable to cast object of type ‘System.DBNull’ to type ‘System.String’.

This is caused by the Download Manager examining prior downloads but failing when it finds a empty data (a null file hash) from a previously-failed download. This can also be caused (in newer versions of the QDDM) by trying to download your first download during a month when your subscription does not permit a download (purchase a Quickmap monthly subscription or wait until the next download is available to your account).

In some cases, this error can be fixed by clicking on the Browse Data button and deleting the contents of the Staging folder. Alternatively it can be fixed upgrading to the latest version of Quickmap Data Download Manager, which contains a bug-fix to handle this scenario better (for some causes of the error).

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