Hi Rikki
Yes, you can use your existing software, but there might be a "crossover" fee charged for another install. It varies with the company and program. The range I have seen is 0 to $69. Some give you two installs from the start. Some, no restriction.

GPO and Collossus have no charge. You can use their helper file free. I don't know how many authorizations they give, however.
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact