with an update version, you simply extract the file into a folder like downloads or create a folder called games. Then copy and paste the contents into your existing folder of the game from the last release. For example: My Downloads/Games/ASeriesofChanges-x.xx.x-pc/(here) and replace files if prompted.
That's what I did. I downloaded V2.1 and the 3.1 and 4.0 updates. I extract 2.1 into a folder, extract 3.1 and copy the contents into the 2.1 folder, overwriting all, then extract the 4.0 into the same folder and overwrite all. The game splash screen says it's version 4 but when I play it I get an end of content screen after the hair salon. I'm not sure what I'm missing...