Actually, TU, check your older versions... I found that the latest beta build 1.99.99 is gone. The folder is still there, but the exe is gone. And if you try to install that version the installer says a newer version is already installed.
The newest version that still works is 1.8.64, which doesn't have a lot of functions, and still has 'color', in stead of 'colour' in all the nodes. So that will cause a lot of error messages for stuff the older version just can't read.