Hi,
Please go to your "My Presonus" account, there hopefully you have registered your Presonus hardware and software. Click on you "my hardware" and select your mixer ...in that account you'll find the latest update update... using the "firmware recovery method" download the update, unzip the files and put them on a formatted thumb drive and follow the instructions. This is the only way you should use, to insure no artifacts are left of the old drivers. There is a video there as well detailing the process.