I checked the two uploads. Both the male and female files for the V1.0 load a complete new image into the pleo memory. Both of the V1.1 files do not, they simply update one file, the file that differentiates the two sexes. So, the V1.0 update has additional files the V1.1 file doesn't. The V1.0 also appears to have an extra folder level, which may confuse some people. The one file that is different was released only five days after the V1.0 file, so I'm not sure how much difference there is.
If someone wants to play, you could try removing the automon.txt and pleo.img files from the V1.0 to match the file structure of the V1.1 and see if that fixed the problem with the update failure.