Well lol…I just went through the same thing. My client’s site is running on Sistina from Yithemes. After backing up, I deactivated the new woocommerce. Uploaded the older version via ftp…still having major problems. Client, rightfully so, is looking into other options.
Support is slow due to this woocommerce debacle. They don’t answer on weekends.
After reinstalling old version, go into woocommerce settings and check status. I had outdated theme pages that were causing issues. I was able to get new versions from support but now am having four other problems…PayPal is hanging randomly; some contact forms are throwing errors, others not; New order emails not sending to admin nor customers; and client can’t mark orders completed.
If I find out anything else, I’ll post…if you come across anything, let me know.
Thanks