Dear Craigs,
I just verified the installation of Embedded Wizard Evaluation Edition and the STM32FX Platform Package once more on a PC using Windows10 and it seems to work as expected.
Please ensure to install first Embedded Wizard setup and afterwards the Platform Package.
Please have a look into your system-control folder 'Programs and Features' - there you should find the following entries:

If you still have a problem, please try to download and install once again.