peteslive: with "installer" you mean the base game?
By installer, I mean the exe and the many bins that you download and then, by launching that exe, install the game on your PC.
peteslive: So, if i have e.g. a new computer and i download (fresh) the installer/base game , there is already the latest patch included?
This should be true, but it never hurts to check the version number before going to the trouble of downloading.
peteslive: or i install the game from my backup basegame/installer and update it with the patches which i also stored and let autoupdater do the rest?
I thought we were talking about the offline files that you must download yourself. If you are talking about some kind of "autoupdater" then you must be using Galaxy. This downloads the correct version for you, and updates it as needed. Though if you use it (and especially if you use any mods or link up with others for multi-player) I would recommend that you turn off the autoupdate feature.
peteslive: So, i get it, the patch (8 atm) is basically the whole game? which explains the same huge size like the basegame
The word "patch" in gaming circles means a fix for an application. You run it and it applies changes to your installed version. If you run it and you do not have the game installed, then the patch will fail. It will not install the game for you. It may be a bit confusing because this version of the program is called the "patch 8 version".