Hi Keith,
Yes I did get an error saying that "QtOpenGL4 dll is either not designed to run Windows or it contains an error. Try installing the program again using the original installation media or contact your system admin or software vendor."
What I did was I copied the Qt dll files from previous version 4.1.39 and overwrite the Qt dll in version 4.1.43 and it works.
Hope I explain myself clear now.
Cheers,
fixrouter