The TaxAct Professional Editions install so they integrate into the same program file (EXE). This means that if you have installed multiple federal editions (1040, 1065, 1120, etc.), all editions will run from the same desktop icon or program file. TaxAct integrates editions so you can manage all return types from the Client Manager.
After installing the federal edition for a return type, to create a new return:
This will create a new return of the selected type (1040, 1065, 1120, etc.) in the program.