Download the PCL6 driver and the TWAIN driver immediately. Store them on a USB drive. Kyocera has no obligation to host these files forever. When they disappear from the download center, the FS-1120MFP will finally—truly—die.
Before installing new ones, go to Windows Settings > Bluetooth & devices > Printers & scanners. Remove any "FS-1120MFP" entries that are greyed out or showing errors. kyocera download center fs-1120mfp