Missing ps3000aApi.h in PicoSDK 10.6.10 (64-bit)

I've downloaded the PicoSDK 10.6.10 (64-bit) and the PicoScope3000SeriesAApiProgrammersGuide.pdf. I'm looking at the 'C' example program in section 6.1 and it mentions 2 files - picoStatus.h and ps3000aApi.h but neither of these files are in the SDK I downloaded. Where can I find these files?

These files should be installed in C:\Program Files\Pico Technology\SDK\inc