I succesfully uninstalled 1.5.0 & ran the 1.5.1 installation in expert mode following all instuctions. I received an error at the end of the installation & after being asked to reboot that no printer had been installed. Upon checking the Windows Devices & Printers Window all of my printers had disappeared.
After rebooting my printers had all come back but not the PDF Creator printer.
I then uninstalled PDF Creator (the files were all there & the group in the start menu & desktop icons had been created) & re-ran the installation. At the end of the installation I received no error message but PDF Creator had still not been added to my Devices & Printers window.