Not sure why I'm not seeing the third version.
I have.... but it's tedious..... I would've thought it'll work like if I didn't have SquirrelMail et al installed - which I don't - when I mark it as YES in options, it appears on the 'Update'..If version is not installed, it has no updates available. Please try installing it using "Build PHP" button, then, where updates are available in the future, they should be shown
Are you sure you’re running DirectAdmin 1.57?