How to revert?

I'm wondering if there is an easy way to revert to the last version. I didn't see it coming but when I upgraded it broke my sites interaction with jlex review. I have contacted the so they can get to fixing it but if thats gonna take time I'd like to just have the old version back.

Please advise. I don't know if jlex will need the new version installed to make the fixes but otherwise I would just want it reverted. You can use my credentials from my last post. Or just inform me the best way to proceed. You may also of course feel free to fix the jlex interaction though I suspect you are all very busy right now.