Cannot reinstall Project 2016 Std retail on replacement HD. Product key alreay in use.

Copper Contributor

Hi there. I need help.  We had purchased Project 2016 Std retail box through Staples a few years ago. I had to replace the hd on a laptop. I still have the retail box and product key. However when I try to download the software through I get the message saying "Product key already in use." I've tried calling Microsoft support, but I keep getting transferred in circles. Is there anything else I can do besides pay $499 for one-time support just to unlock the product key?  We paid $749 for the Project 2016 Std retail version. 

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