Where do you download the hotfixes? I'm on GoG, not steam.
Start the Galaxy client and select the game in your "Installed" list, then click on the button on the right of the "Play" button (settings-like icon). Select "Check for updates".
Usually the Galaxy client will auto-check for updates when you start it. If there is a new update, it will be in the Download section.
You can also set your game to auto-update (the download will start on its own). If not, you need to manually start the download once you see it in the Download section.
There is a "View patch notes", but unfortunately it's not up-to-date, whoever maintains this on GOG often forgets to put the latest notes. Really, the only way to tell which version you have is to launch the game, but since it's not possible at the moment, you can only check for new updates. If there isn't any, you have the latest hotfix already.
