I only use freebies but if you insist on paying then check out their forums. I can't see why their latest should have any problems with 8.1 though.
If uninstalling Norton remember to use their uninstall tool.
Surface Pro 5 News - release date, UK price, features, specs
Gear VR vs. Daydream: Which delivers the best VR experience?
Best Mac antivirus 2017
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.