I've downloaded Active Sky for P3Dv4 (BETA), AKA ASP4 and although it's not finished yet it works more than well enough.
If you have Active Sky 16 for P3D V3 then you can download it for free and just use yout old authorization to activate it.
There's no need to uninstall your old AS 16. They're two different programs pointing at two different sims.