Yes, there is. I can't remember which point update of v6 HDR merge came with, but it's certainly there in v6.14.No there is not a HDR merge in this version of Lightroom. It came some time later with one of the updates to the 7 or 8. There is an option to send a selected set of images to Photoshop if you have that to do either an HDR or Panorama merge.
And also the exact same dimensions in pixels. That is no problem when you shoot in raw (because raw edits in Lightroom are ignored), but it can be a problem when you try to merge jpeg or tiff files. Just a few pixels difference will make that fail.And did you confirm that you have sufficient overlap in those 8 images?
Also, when using LR 6.14 I'm pretty sure that all the images in the selection have to be shot using the same focal length (that restriction was removed in LR Classic), so check that as well.
You could upload the images (half-sized JPGs would do) to a file sharing site and let us have a look at them.Gentlemen, you are helping immensely, but I'm a very senior citizen and soft, apparently, in the head. I made a 3-image panorama successfully, but my 8-image attempt has failed several times. Two of the images merge, but that seems to be all. Hm.
In answer to your question, yes, the Classic eBooks are completely up to date. Lots has changed since LR4! But it looks like you got some great answers to your pano questions already.I have one of our lovely Queen's books, but that was for LR 4. Do you know if her more recent books cover the topic of panoramas?