Windows 8.1. I’ve got 8.5.3 and 8.5.4 nightly running side by side. I’m always using the nightly, as it has fixes I need (looking forward to the next nightly.)
When I try to install the 9.0 alpha, however, I get an error message that it’s already installed and that I have to remove the previous version first. It’s not already installed.
I see that same message if I forget to uninstall the previous nightly before installing the latest nightly, but this is the first time I’ve tried to install the alpha. I have no intention of uninstalling 8.5.x in order to test out the alpha. But I really would love to take a peek at it!