http://ultidev.com/forum...Dev-Cassini-to-UWS.aspx
The answer is yes, in vast majority of cases. You can simply run UWS installation and it will upgrade (uninstall) Cassini 2.0 and disable Cassini 1.1 service if it's installed, while keeping all the applications running in Cassini compatibility mode....
I'm trying to upgrade UWS Pro from v2.0.17 -> v2.0.21 and running v2.0.21 MSI seems to upgrade. However, I'm curious if I need to follow any specific instruction.