How to install plug-ins to enable mediamonkey to support DSD playback？

My mediamonkey was purchased from 2012 to 2013. I can’t find the order and license key. It can still run on my old computer. How can I retrieve the license key?

I purchased the lifetime version of mediamonkey. The computer I installed before is very old. I want to uninstall mediamonkey from the old computer and install it on the new computer. How do I activate mediamonkey on the new computer？