I purchased the version for WHS which includes licenses for up to 10 clients on top of the WHS. I then installed the Pro version to the desktops/laptop I have here and I run a scan on one desktop nightly that is on 24x7. So that appears to be working, provided you got the license and installed the Pro versions (I think the WHS one can install to remote clients but I forget, I did it myself and it shows up on the WHS Avast tab in the WHS login) you should be ok at that point.