Understand this is beta everything takes time for the developer to do and he is doing the best he can. I would have the the devloper take there time do it right then rush and sure we all want it done now but now will come when the time is right along with the features
I get no error. few things to check for make sure you have nothing running when you install it, turn your security off make sure that is not blocking it you can use revouninstall to do a very clean uninstall. the last thing you can try is going into safe mode and trying to install it that way and see if you get the same error. sometimes the update hangs on your screen during install leave it will move it's installing dll's and other files it will need to run be patient
Some videos are jumpy and are not able to watch some videos are fine but all still have no sound while watching them. We all need to report this and work together to help the developer. I love the new layout looks very slick to me.