Thanks for the reply! In the "Manage Plugins" section, from the "available" tab, I filtered on workflow. There was only one workflow so I added it. Unfortunately that only added some of the plugins. Without the filter, I sometimes saw multiple workflow plugins and other times did not. Needless to say, I'm somewhat confused as to why the don't all show up all of the time.
After a number of installs and uninstalls, what seemed to work for me was going to the available tab, installing what I could find without a restart, going back, installing more, and repeat a few more times. Eventually I had all 8 or so workflow plugins installed.
This is apparently a bug but I'm currently unable to sign into the bug tracker.