HOME defined in an environment variable. Starting with Julia v0.5.0, I could install packages, but I could not load them with
import. It turns out, I had the capitalization wrong in my
HOME environment variable. That hasn’t been a problem with other programs (including Julia v0.4.x) because Windows programs don’t normally care about file/path case. Once I fixed my capitalization, things worked fine.
It might help someone else who was confused by this. The error message wasn’t obvious other than giving me a good place in the code to start looking.