If it is possible for you, Windows 10 upgrade means improvements in term of security and usability.
But in my time - zone really few hours have remained to run it for free...
About AhnLab, according to AV Test, the v9 looks like a good product, definitely up to date than the old version you use and It's highly recommended always to use the latest version.
Anyway, I also advise you to switch to a different solution such as Avast free or one of your choice: here you can find tons of discussions about this.