Hah, good question
. Still running 372 here and /checkupdates doesn't report a new version, but downloading from the site indeed gives me 375.
It's not totally uncommon for Plus! to offer slightly newer builds on the site though. Usually these are very minor improvements which aren't worth bothering people with an auto-update notification. So only people who download a fresh installer from the site get them, other get them when a bigger release is available so they also have some new features to enjoy.
Wouldn't hurt updating the build number on the site though.
/ 
