I finally spoke to a TurboTax rep that was able to provide a solution. You'll need to call TurboTax and while you are on the phone, go through the following process... In the TurboTax Business software in the state section, when you click "Start" to download state forms, in the next box that appears do not click "Continue" INSTEAD click "We can help you here." In that box, you'll need to provide the TurboTax rep with the serial number listed. Then the rep should give you a "Confirmation" number to enter. This serves as a "business unlock" code.
So TurboTax DOES have the Maryland Partnership forms available. There seems to be a glitch in the programming to install the state forms. But the above mentioned process worked for me. Finally!