Hi,
I was going to create this topic to report an issue without a workaround, but it turns out there is a workaround, so just leaving this one here as an FYI.
When I opened the paid version of the app for the first time, the white view the blocks the lite version showed up (see attachment) and I couldn't dismiss it. Hard-resetting the phone (i.e.: home + lock buttons) resolved the issue.
I had used the lite version previously on the same phone.
I had previously tried without success: killing the app, deleting and reinstalling, turning phone off and back on.
iPhone 6s
iOS 10.2 (14C92)
Regards,
Gustavo