Hello Margaret,
Thanks for using our plugins and welcome to the forums!
As a first to give you some information about our premium support, as per our policy we try to respond to every question within 24-48 hours during the week, so Monday to Friday. That is why you had to wait a bit for the first response.
I’m really sorry you bumped into an issue. I’m not quite sure why that happened as when activating the Pro plugin, the event data is not changed, it should be preserved as it was, including the timezone setting.
Please give me a bit of time so I look into this issue. I will get back to you soon.
Thanks for your patience!
Cheers,
Andras