Hello Don, The driver downloads page of the Starlight Express website offers:
Current Version Signed drivers for 32 and 64 bit Windows 7, 8 and 10 (version 18.104.22.168) N.B. Do not use with Windows XP!
So, I installed this, but as you note the X2 camera doesn't appear in the PHD2 camera selector.
However, I did notice lower down on the Downloads page:
‘Starlight Live’ software for use with SX mono and colour cameras. Also
works with the Lodestar and Lodestar X2. Version 3.4 now available with
bug fixes and more advanced support for all SX cameras and the SX filter
wheel (released 16/3/19).
Have you tried that?