Yes, I downloaded directly from FXSound and installed on my desktop but later found it on the Windows Store. This is where I found the problem. It gives the error message when I try to download to my laptop I have NOT installed FXSound on.
If FxSound is already installed then you can uninstall it before downloading from Windows Store.
I am not able to replicate the error from Windows Store. So, can you please share the screenshot of the error. We can contact Microsoft to find a resolution.