When you want to install a newer version we advise you to install it in a separate folder.
Eg. "CNC 4.03.60', that way, you will not lose anything instead of installing it over an old version.
Next, you copy 'CNC.INI' and 'macro.cnc', optional maybe 'user_macro.cnc' if anything is relevant.
Once you have added/replaced these files in the folder of the new installation, it should work.
The upgrade procedure is now included in the release notes.