Sorry, missed Saturday, but these sort of errors usually mean dirty floppy drive, dodgy disc, or corrupt download.

Standard PC "Floppy Disc Cleaner Disk" should work (if it involves claening fuid DONT GET IT TOO WET)

Could the floppy disc be verified on a PC?

Is the download available somewhere else - download again and compare the two files to see whether they are the same?

Good luck!