Dolf Gulicher

Hope I did this correctly, if not let me know and I'll redo.

Thanks

Happy to do that. However I don't have a DIM folder (there are DIM1 and DIM-1). There is another Region folder though.
Should I remove any files with a number of 2 of higher in their name?

I restored to game to prior the mods earlier advised and went into creative mode.
I had to rebuild the portal 3 times, each time 1 level lower and eventually it spawned a new portal and was able to spawn the dragon.

I killed the dragon and the Endcity portal spawned. All entries in DragonFight are now correct.

Thank you very much for your advice and best wishes for the New Year.

RimaNari, thank you for your response.

My <DragonFight> had 3 entries, Gateways (which had 20 gates in apparent random order from 0 to 19), DragonKilled 1 and PreviouslyKilled 1
I removed from the top down 19 gates(only nr 13 left) and used the work around as in the tutorial, however nothing eventuates.
There is no <ExitPortalLocation> either. Any other suggestions? I hate to have to abandon this world as there is a lot of work in it. 🙂

Thanks

The problem still exists for me. I have the situation 3 as described in Anomie X's comment 22/Jun/16.
My world however was created in a very early version of Minecraft, years ago. It was updated to version 1.8 and stayed there until I found that in my profile it was set to use that version. Now I have updated to 1.11.2 and because the new additions to the End I wanted to go back and can, but alas cannot respawn the Dragon.
Any advice would be appreciated.