Hi Carl Ben Hayford. :)
I think you can download directly the free trial on panda website and use the license key provided by sharewareonsale: Panda Gold Protection Free Trial Download Button (click).
It should be always downloadable from there, given that you can always uninstall it and reinstall it until it expires (after the six months).
I’m currently trying the ashampoo antivirus offered here and it works in that way: I already uninstall/reinstall it few times.