So that you may understand why i and some others had issues with Germany I will explain what i did from scratch.
I had a fresh 2012.I added the main parts of the 2013 mod then chose the tyre gfx I wanted then installed your AI mod and updated it right up to version before the new tracks arrived. It worked flawlessly. Then your new version 4.1 came out and i added the update from the zip.I didn't add the Nurburgring+Istanbul mod and just had you Nurburgring version as part of your zip. Germany crashed when I got to that track on a new career season as I started again because the save file was corrupt.
Today i added the Nurburgring+Istanbul mod
http://www.racedepartment.com/forum/threads/nürburgring-istanbul-park.72104/ on top of 2013 plus your 4.1 which crashed at Germany, but it now works at Germany. So i wonder if that the missing Istanbul was causing the issue even though I hadn't got there yet.
Perhaps not but as your mod has Nurburgring included i didn't think i needed the separate tracks as i hadn't reached Istanbul yet but now I have added them both after and iot works i wonder what might be wrong with the 4.1 which just includes Germany.
It might be nothing but i wanted to explain what i did up till the crashes in case it helped you work out why myself and others have had issue with 4.1
Thanks again for your efforts i love this mod so much
Cheers