Hello,
Sorry to hear you are having issues. Have you ever run any version of Fences previously in the same system or same email address? If so that is why. Try these steps,

Press the Windows key and "R" at the same time. A "Run" dialog box will pop up, please paste the path below into the "Open" field and press OK:

In the folder that pops up, you should see a folder named PRODUCTNAME (<-- the product that is giving you the error). Please delete this folder and all of its contents.

Once that is done, try trial activation again.

Thank you,
Basj,
Stardock Community Assistant.