When installing 1.2 (64 bit version) over 1.1 seems not overwrite the existing files. When I start SK again after installation (SK is closed during installation), it again reminds me that 1.2 is available. In the about dropdown menu it seems that 1.1 is still installed. Tried to install it twice, with the same result.
Although 1.2 has been installed okay when you start SongKong64.exe it looks in the lib folder for the songkong jar and finds the old songkong1.1.jar before the songkong1.2.jar and uses that instead. Please manually delete the songkong1.1.jar and songkong1.0.jar if they exist. I hadn't considere d this issue, it is not an issue in Jaikoz because the main jar file is always called jaikoz.jar.