Many thanks, hazelnut. I've installed the free version.
By the way, I clicked too quickly to install it (well it is nearly midnight & I need my beauty sleep!) - I forgot to uncheck installation of Avast, It took me 40 minutes to uninstall it using Revo Pro and was a real pain as the Avast 'survey' required restarting my laptop which in turn interfered with removing it. All done now. Many thanks for your help - much appreciated.
I can't find how to mark your reply as the Answer so I'll do that in the morning after I've read the FAQs.