Hi: Having the same problem, but the solution stated doesn't work and I've tried it many times. After downloading 12.0.1, nothing appears in the download or my default download folder. What I did find is these two files,
iTunes Library.itl
iTunes Library Extras.it
which apparently download to:
[DriveName] ▸ Users ▸ [viceuser] ▸ Music ▸ iTunes
Is this the correct behavior? In any case opening iTunes after these are downloaded does not update to 12.0.1, but remains at iTunes 12.0.0.140. I also tried the only other thing I can think of, which is to directly click the two files above. For some reason, the Mac tries to open them with Windows iTunes (installed in parallels and on Bootcamp. Forcing them to attempt to open with Mac ITunes, Mac ITunes oppens, but ITunes does not report the new versions.
In all attempts I started with iTunes not running.
As the Application Store is so insistent, this feels like torture (no, not the real stuff we did/didn't do recently; the former Vice President was not involved in any way, I'm certain). To add water to boarding, iPhoto, which I would rather disappear, seems to open every time I connect my iPod, but I may have (may have) turned that off using a "switch" even though the documentation wasn't clear and I had no idea what I was/am doing (unlike the former Vice President).
Thanks!
Mark