update probably won't help. is your os windows 10S. in its default configuration you can only install apps from Microsoft Store
You can switch Windows 10 out of S Mode to eliminate this restriction
Open the Settings App
Go to Update and Security - Activation
In the Switch to Windows 10 Home or Switch to Windows 10 Pro section, select Go to the Store. (If you also see an "Upgrade your edition of Windows" section, be careful not to click the "Go to the Store" link that appears there.)
On the Switch out of S mode (or similar) page that appears in the Microsoft Store, select the Get button.
After you see a confirmation message on the page, you'll be able to install apps from outside of the Microsoft Store.
if the OS is not 10S then have you installed all windows updates especially those that involve net framework.
you can also try a complete shutdown and then reboot to try to install again
did you purchase the app from a legitimate source?
then you can try support again to push a download to see if that will install.
