Here is .bin for DFU v3.10 https://www83.zippyshare.com/v/6pQlQcFx/file.html
Here is something else to try DFU_C312-SYS_B160-FPGA_V261-APP_PA1_V111_LOGO-Seeed(BC3B).hex.zip https://www83.zippyshare.com/v/8ySSwlw5/file.html
I don’t have experience but I think you can upload everything with 3.3v Serial adapter and Flash_Loader_Demonstrator. Other option is load latest DFU and then use computer to copy to drive sys,app,fpga. If DSO in DFU mode shows up in computer then you only need to upload latest app and sys and fpga for hw2.72.
Btw, DFU older than 3.46C required Windows XP or 7.