Hello,
I downloaded the experimntal version for the recent, for me, Windows 10 May 2019 update. Just now, my laptop began showing the DOS box window running and the in-place effects.
As usual, the watermark showed up brings brings up the question: shouldn't the user not have to use one of his/her four key downloads with the experimental versions? I just downloaded my fourth.
I'm going to make another donation, but if the experimental use of keys is considered policy, I think that should be noted on the experimental version download webpage. After all, there is some risk in using an experimental version, albeit small, I imagine.