There are versions of downloads?

I was reading some forum threads at woody's and I came across this Topic: What are these preinstalled 8.1 updates from November 2014? @ AskWoody (https://askwoody.com/forums/topic/what-are-these-preinstalled-8-1-updates-from-november-2014/) And in the thread they mention ISO version #3 and then in the lost post they mention version #4. I tried looking at the properties of a download and...