Just a little rewording...
If you have dowloaded the software update OS 10.4, but did not install it, below is how to delete it.
- Open the watch App on your iPhone.
- Then tap on General.
- Then scroll down to the word STORAGE and tap on it.
- If you find the download Watch OS 10.4, Delete it. Do NOT delete the current OS.
- Restart the iPhone and the watch. Then start the download again through your watch app on your phone.
The download is fairly quick, but the "Preparing" is very, very long. Don't watch it.
Just leave the watch and iPhone for about 1.5 to 2 hours.
Then come back and it should be done.
If no display on the watch, just touch the screen.
Hope this helps
I did this the first time, but to no avail. I waited all night long and a full work day. But I did retry again the next day and it worked in less than 30 minutes from start to complete.