I'm betting no one here has tried it, but I'd be happy to lose...
Try it and let us know!
Encore was only 64bit with CS6, so I don't think it should be a problem. Make sure you set it to "run as administrator."
In another forum, a user was trying to install and use EncoreDVD 2.0 on Win7, and though many had suggestions, could never get it to install. That does not mean that there was not a way to do it, but only that several folk could not find the way to do it.
I'd be curious about Encore 1.5 and Win8 myself - I doubt it, but that is based only on some other, similar failures.
Good luck to the OP,