Ah, yes, I need to adjust the doc to reflect the change that octopi no longer uses a pastebin service.
Looks like you have the correct octopi version, but the behavior you descirbe is why octopi went back to a later an earlier checkout.
Version 0.9.0.85 implemented a new way of using pacman, but is thoroughly broken, 0.9.0.86 uses a checkout from before that change.
To test if it is a system issue, create a new clean user, see if you still see it then. Also, just to be sure, re-install octopi.