Initially, try to rename the InstallShield folder.
You can accomplish that with the help of the "File Explorer" or in "This PC" as well.
Open the following folder: DRIVE \Program Files\Common Files\
Right-click the Installshield folder and then select "Rename".
Type "InstallShield1" and press "Enter".
Please try to install the driver afterward, either through Driver Genius directly or from the downloads folder manually.