https://www.pigtronix.com/uploads/pigtronix/2020/11/SPL-2.0-Manual.pdf#page51 Bottom of p50 seems to indicate that your f/w is already up to date. Do you know what version you presently have on your Infinity?
Also, when you plug your looper into your USB port, can you see the USB as a storage device on your computer? If so, can you get the info on the SD card to determine how it was formatted? It should be MS-DOS FAT32.
You may have to give the app Admin permission and especially if you are using a newer version of Windows.