You said "The 404 erros: I dunno which links you mean in detail but most likely they are not existing anymore then as they were too old." here are the links to the addons... the descriptions have the links I followed.
https://www.esoui.com/downloads/info...ersOfNirn.html
the Igor research assistant can no longer be found on your website, but can in minion, just look up "igor" it will show the addon I mentioned, click on its name and it will give you a description... the 2 blue links are the ones I mentioned that give 404 errors.