Thanks for posting!
TBH, I only added instructions for the other platforms after others asked, and you’re the first for Windows. I haven’t tried to recompile libvips on my Windows box, but it should be doable.
That said, if you can wait for a week or two, the next version of PhotoStructure will switch to using an external HEIF tool (much like how videos are transcoded), and installation will be simple on all platforms: just install heif-convert.
Check out this section in the release notes for more details:
This change also addresses this bug: