when you download the file which is 2.09 gb, it is compressed or zipped but when you uncompress or unzip it, it becomes 2.39 gb and thats the main file or game file.
You did say "i downloaded the mac version file of around 2.39 gb", so I assumed you meant the size of the downloaded file is about 2.39gig. Otherwise you would have said "i downloaded and extracted the mac version file of around 2.39 gb" -- but nevermind.
All I was trying to point out is that you may probably have the wrong game file at all. The current downloadable file for Mac is about 2.09gig (although the Mac Finder will say it's 2.25gig, but that's because the Finder is just wrong

), and the extracted "Game.app" file (which actually is a directory) is about 2.73gig (again, the Finder will say it's about 2.93gig, stupid Finder

).
The "65.0.3325.146" you see there is just some kind of internal version numbering for the App itself, it does not correspond to any game version the developers may choose.
Also, as somebody already said, you can always open the Soul Crystal in-game and see the version you're playing in the bottom left corner:
and no i didnt download and installed any cheat mod.
Good! I just asked because the Cheat mod will impact your game experience in an unpredictable way and does produce a lot of issues.
Btw: there will be a new version of this game in about three days, so instead of waiting a few hours for the current version to download and then have to download it again in three days you may just want to wait three days and download v3x061.