Alduin's Bane quest bug

Use console commands to fix it:

Alduin's Bane has the Quest ID 'MQ206'.

1. Make a save game of your current state using the Main Menu (not a quicksave).

2. Find out what quest stage you're currently in by typing in Player.sqs MQ206 in the console.
   This will show you a list of the stages of the quest. If there is a 1 behind a certain stage, it means you passed that stage; if there's a 0, you haven't.

3. Find the last quest stage you have completed (the highest number with a 1), and note down that respective quest stage number.

4. Still in the console, enter the command SetStage MQ206 <quest stage #>, where <quest stage #> is the number you noted down during step 3.
   Your character has now entered a stage earlier in the quest.

5. See if the quest works properly now.

   If not, repeat the steps, incrementally replacing <quest stage #> with a stage number one step higher/earlier from the one you found in step 3 (e.g. 10 instead of 20) , until the quest completes successfully.

In your specific case, I assume your character's current stage is 10 (where the objective tells you to "Read the Elder Scroll at the Time-Wound"). Preceding quest stages are 0, 1 and 5.
Try SetStage MQ206 5 first, and see if that works.
If not, try setting it to SetStage MQ206 1, and otherwise to SetStage MQ206 0 (make sure you still have the Elder Scroll at that point though).

I'm not sure, you could revert back to an old save before you got the Elder Scroll, you could use a command to finish the main quest, but I'm not sure if you'd want that. The best thing for it is to simply revert back to an old save.