AnyDVD 188.8.131.52 was released twice. This was discussed in another forum that I won't name or link to. I think you can figure out where. Anyway, this was discussed. It was released and then re-released about 4-5 hrs later. The second release was smaller. The reasoning was that a file was included in the original installer that wasn't needed. In the second release it was removed. There is no difference in the actual software, itself.