I had no problems stitching your images with V11. I did the following:
1. Load in the images (first six - #7 is a duplicate)
2. Enter crop size 1 then click OK
3. Enter focal length 10.3 and select Generic Fisheye Lens in the Lens Type field
4. Click OK
5. Select the Crop tab from the list at the side, and drag the crop circle to position it just inside the blue edge of the image circle if necessary. (click&drag the edge to alter its size).
6. Reselect the Project Assistant tab and click Align Images.
If that doesn't work, select Advanced mode (at the left) and open the Lens Settings tab. Compare settings with mine (I entered 9.2 as the estimated focal length):