Starting with V0.6.83 the user-directory will be the same as where you put the TAXINAUT game files (from the zip file). It was in something like C:\Users\username\AppData\Roaming\taxinaut because initially I thought TAXINAUT be installed under "Program Files" but ITCH.IO peoples seem to prefer zip files and just copy to the folder of their choice. It also makes things easier for testing for myself because now I can keep different versions and run them from their respective folders and they will use the save games and configuration etc. that's there.

So, if you want to keep your configuration, save-files and user.dat then you should copy these to the TAXINAUT installation folder after installing the new version but preferably before running the new version.