And apparently a whole lotta other people didn’t:
https://www.reddit.com/r/PleX/comments/191b4xy/psa_you_might_still_be_running_32_bit_plex/
And I’ll wager you’re still on 32-bit, because Plex didn’t notify us.
I was.
It’s a 5-minute fix. It should be automatic, or at least notified: