Can't remember the exact wording, but it something like 'there is a later version available' or 'the there is an update available'.
Here are the three screenshots, which confirm my worries about not having the full 90-days were unfounded!
I must admit, I was a tad confused when starting the apps up a second time thinking I should click 'Unlock with Product Key' and not the 'Continue Trial' - silly me. It'll be a learning curve...
All's well now.