If you installed CWM or TWRP to internal memory you can update to CM10.2 without an SD. But there is an issue if you use the cmupdater to do it. The issue is where cmupdater puts the file versus where CWM/TWRP expects it to be. See the Dummies thread for an explanation. See the note at the bottom of the first post in that thread.
Sent from my BN NookHD+ using XDA Premium HD app
See my Nook Color Tips Thread here
and my Nook Color EMMC Partition Repair Thread here
and my Nook Color Updated CM SD Installation Instructions here
and my Nook HD/HD+ stock tips thread here
and my Nook HD/HD+ CWM Root Tools thread here
e.mote's Nook HD/HD+ Dummies Guide for installing CM10.1/CM10.2 here