I downloaded it and copied it to my Nook. It is just ignoring it. I tried different sleep times - leave it on for 15 min, tried 2 minutes, etc. I just ignores it.
I did this type of update successfully with Color 1.3 (and also 1.2, if I remember), and several times with my Classic and Touch and never had this happen. Every other time I've done this, the device notices the file's presence in about 2 minutes and starts the update.
I guess I'll try downloading it again and copying it again, but the zip file looks OK on my PC (i.e. it isn't corrupted or anything).
Downloaded it again and erased it from Nook and recopied it. Still being ignored.