Hi,
no, if you have an individualized profile and individualized screenset you should be able to download the latest
build and install it WITHOUT affecting your existing settings.
When you run Mach if you View/Load Screen/wx4.set <open> your screen will redraw with the wx4.set screenset.
If you like it then close Mach. That would flush your newly preferred screenset to the .ini file ie it becomes your
standard screenset thereafter.
You are strongly recommended to make a copy of your preferred screenset, wx4 say, with an individualized name.
Then load that set and close Mach to have it flushed to the .ini file.
Thus all your screen edits and scripts are saved in an individualized file. When you download and install an even later
build and wx4.set is overwritten by a fresh, and possibly modified coy from NFS, all your screen edits etc are not lost.
Craig