There's a huge size difference between the two, both Linux and Windows releases. Even if they do both work it's just insane to have two different version of a release. A version number should mean something, that's such a basic concept it just astounds me that it's not obvious to these guys. I should get an identical checksum regardless of where the IDE was downloaded from. This makes providing support more difficult. Now when someone comes here with a problem I can't reproduce I have to find out which site they downloaded their IDE from:
"I got it from the Arduino website"
"Which Arduino website?"
"Huh, there are multiple Arduino websites WTF?"
"It's a long story..."