Clicking on the available time slot when not logged in hangs indefinitely.

No form appears no matter how long you wait. It worked when initially tested (Mac, PC, Android) which is why it was pushed live. But apparently doesn't work for end users at all now. Used to get 20-40 online requests per month. Had 1 since switching to this plugin in September (two months ago) and that was through alternative channel. I just paid for an upgrade and updated the code recently.