I am experiencing the same problem. Whenever I try to update the Jetpack plugin, my site crashes and I get the 403 Forbidden page as well. I will monitor this thread for updates. Thank you.
David, I am also trying to setup a weekly donation option but I do not see anything in the Form Options tab. The only thing I see is the place to “show” the Repeating Donation Checkbox. I don’t see where to select the frequency of donation. Your guidance is appreciated.