I'm using vuforia 4 cloud reco and everything seems ok with license key etc and seen some updates in the vuforia 4.2 version. So, really do i need to upgrade to 4.2 or 4 is enough.
My app run with Cloud Recognition. So, everytime i need internet connection. So, i don't like to upgrade to 4.2.3 Shall i keep run my app with vuforia 4.0 and have you change anything in future about the license key because now it has different set of licence for vuforia 4 and newer.
The release notes have additional info about 4.2.3 which might help you decide:
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