[Pharo-users] External module not found

I have a most peculiar problem. I've been using Pierce Ng’s PasswordCrypt <http://www.samadhiweb.com/blog/2017.02.18.shacrypt.html> encryption package with Pharo 5. Now that I'm using Pharo 6, it doesn't seem to work anymore. The ffiCall:module: message always gives me "External module not found". So my question is, what alternative package can I use to replace the it for Pharo 6? Should I go back to Pharo 5?