I'm not sure what you are asking, but the pro version won't expire . . .

The 6 months are for 6 months of updates from a personal Pro download page, so just keep downloadling the updated versions from your Pro page as long as the page allows. Once the time expires so will the links on the page (or at least it did the last time I checked), and there'll be a message encouraging renewal.

The pro version you already downloaded will still continue to work.

Cheers