Please open the browser on the device and click on the icon at the bottom as marked in the below screenshot:
After clicking on the icon, menu will appear at the bottom as shown in the below screenshot:
Click on the settings from the menu. A new page will appear with the option to delete the old downloaded file as shown in the below screen
Clicking on the delete history will delete the file.
Now you can use the URL to download and install the new xap file.