milhouse Something seems to be wrong with your LE 9 builds. Per [gitignore] add /addons/script.module.pycryptodome/ by Rechi · Pull Request #11539 · xbmc/xbmc · GitHub that latest Kodi master should contain pycryptodome, but it is missing.
I'm testing with Milhouse 9.0 Build 1208:
I guess it was removed as documented in LibreELEC Testbuilds for x86_64 (Kodi 18.0)