previous version was 188.8.131.52, so it's unlikely.
Try deleting setup file and redownloading. And remember, you actually have to reinstall the game.
Same issue here. Downloaded the 334mb installer through my browser and the GOG downloader. Installed each one and checked the game each time. Still listed as 1.1.3 and I am sure it was installed over the previous version because the installer gave me the "X already exists" warning.
Edit: Checked the previous messages... Wait, you mean UN-install and RE-install? That's not exactly an implied part of a re-download.. and what about saved games if this is true?
Edit 2: Yeah, you might want to make those steps a lot more clear. As back up saves, uninstall and reinstall are a lot different than just telling someone to redownload the installer.