Hi
I would like to suggest a routine in the installer to check if TOTW has been installed already or not. Because it's really annoying, that I can't proceed the update without Fallout3 Installation. I understand, that Fallout3 is required for the first Setup, but why for the updates? It forces me to keep Fallout3 forever on my hard-drive.
Regards
Yoss
I will risk saying something wrong here but I think it is because the updates are not really updates, they are actually new versions that need to be installed from scratch, maybe :/ . TTW is always getting installer overhauls and remakes, next version the installer will be again a new and improved one.
So it has to require all the FO3 files too because we don't keep older versions and otherwise if it didn't required all the files new users installing the new versions would probably have problems.
Again I am speculating 
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More or less what Rise said. For example: During the installation alot of things are ripped out of your FO3 BSAs/ ESMs that aren't needed because they're already in New Vegas. Between 2.4 and 2.6 a lot of things changed. The only way to update from 2.4 without requiring FO3 would've been if the installer contained those copywritten files we're always bringing up when people talk of piracy or shady underhanded tactics.
EDIT: Note this is referring to what happens to the FO3 files used by New vegas, not the originals. Newer versions may need things from those original files that aren't there in the TTW FO3 files.
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