I explained this to another person before a long time so here it is, in short if you downloaded it from the main page you have the updated game so don’t worry about it.
In a long way here’s what I said to another poster a long time ago: this is merely something itch does. I don't change the version name cause if I do then it replaces the file I already put there, losing all the stats it had, which I want to keep. changing the file name to version 2 or something similar will replace it fully, losing all the previous stats on those files. hopefully, I explained that in the most understandable way. if you download from this page then you are up to date on the game. the newest version will be coming soon ( but delayed due to voice acting lines not coming in) so I may just bite the bullet and replace the original files so there won't be any confusion