The free alternative is, as you know, deprecated and, therefore, isn't supported by Adobe. That's not very reassuring is it?
DMX Zone were supposed to pull support for third party vendor extensions this month but have held off on doing that, one assumes out of the goodness of their heart but, most likely, to gain the trust of people who use other extension vendors before pulling the plug and offering their own products as an alternative. Whatever the reason, it's not very reassuring either!
The point is that we are now relying on two companies, Adobe and DMX Zone, even just to get the WebAssist extensions installed which, in itself, isn't often a straightforward process.
I honestly can't see how this is an acceptable situation to be in and it has me, unfortunately, looking elsewhere for solutions.
It's a real shame, after all these years.