Oops, you're right, packaging error on my part. I forgot the MS SQL package doesn't depend on mojoPortal.Data.Common.dll so I should have included that in the MySql download. I'll fix the MySql download in the morning, its late here. If you need it right now, just download the package for postgre sql and grab the mojoPortal.Data.Common.dll from the bin folder and paste it into your bin folder.
Hope it helps,
Joe