Hello Vertigo !
The first time I just downloaded the update file, extracted it and uploaded it to the game directory overwriting everything. Then after loading the last game state, it fired an error every now and then.
Now I deleted everything and downloaded the full compilation image. The earlier errors no longer occur. Strange, I thought I had done everything right before. It also seems that the problem I suggested earlier was not the direct cause, but that does not mean that I wrote untruthfully about the importance of case in file names in the Linux file system ;)
Thanks for the update !