We do not offer (and have never offered) a trial of Juicebox-Pro so I'm not sure where you are getting this information.
However, we do offer a money-back guarantee. Please see the FAQ below.
FAQ: Can I try a trial version of Juicebox-Pro?
You are free to download and use Juicebox-Lite (the free version) for as long as you like. Juicebox-Lite does not have all the features that Juicebox-Pro has (please see the comparison table on the Download Page) but your Juicebox-Lite galleries will never expire.
If, having created galleries with Juicebox-Lite, you choose to purchase Juicebox-Pro, you can upgrade Lite galleries to Pro by following the instructions on the Upgrading Juicebox support page.
I hope this helps to clarify things.
Please let me know if you have any further queries.