That's right, Autopano Pro did not detect this panorama as a full 360°. Maybe you can try with higher (maximum) settings for detectivity.
Where can it be done ?
You can change the settings for the whole application in the options, or change for this only group (icon with a hammer)
Higher settings will give more tolerance with small overlaps.
To my eyes, overlap between the max-left and the max-right images is less than 20%, and some subjects have moved.
That's why it did not succeed with default settings.
I've used the Panorama built'in APN function to achieve minimal overlap. But yes, subjects have moved
Small overlap is the main difficulty of these sources. Sure, 80% overlap is overkill, but min. 30% is great for accuracy of the geometric and color corrections.
Even if APP cant's find the full stich, you can greatly improve the color correction result. Set a hard anchor on 3 correctly exposed images: one left, one center, one right. Set all others in "white balance + transfert" mode. Results should be great
If you still get color deviations, set other photos in "Transfer function" only.
Now, i'm interested in results
Ok; I'm having a try
PS : multi-layer output is editable in Gimp too.