The cert is just to prove you are you, once it is compiled into the plugin, it doesn't need to be renewed for that version of the released plugin (or everyone's plugins would break a year or two after purchase). However, if you compiled a new version 18 months later, you may need a valid cert for that new version. But you are correct to ask Pace et al because I don't know if this is for the actual plugin or the installer itself.
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