Builds, updates, versions?

[Ollsbols]

Hi Forum,

please forgive my ignorance.

What are the 'Build' files seen in the forum vs the Update v1.04.11479 vs BETA - Update 1.05.12651.00 seen on the game's homepage?

And why does the BETA appear to be a version ahead of the Update but with a Date (release?) that is earlier than the update?

Thanks in advance.