If the installer fails to save changes, it is likely blocked by Windows' folder protection; right-click the .exe and select Run as Administrator .
: Click the Select configuration file button. Browse to the mod folder you extracted in Step 1 and select the .u2car file (e.g., Impreza555.u2car ). nfs-cfginstaller.exe
I've gathered some information about "nfs-cfginstaller.exe". If the installer fails to save changes, it