Hi and thx for the answers. Installer did not work but finally I found this: "https://github.com/boss-developers/skyrim/blob/master/masterlist.txt Click View Raw Copy that onto a text file and call it masterlist.txt" (boss/skyrim/masterlist.txt) There simply seems to be no support/update for boss anymore, so a "new" version of the list does not exist. Apparently that means that the program can´t even create one when running for the first time. So I created that manually and it works. Well, at least for mods until about January 2014(2014, yes), but that still helps. If you deactive the "update masterlist" option, you don´t get any error messages. :-)