Magnum P.I - Season 5 second half of season

Hi, I bought Magnum P.I Season 5 Jay Hernandez series, bought first 10 episodes but as I bought as a series I thought the second 10 episodes would automatically get added to my library,  when released,  but no.   it doesn’t seem to be anywhere to that I can see to buy second half of season 5.   I have bought seasons 1-4 and only need section half of series 5 to complete the collection. How to I achieve this ?

thanks in advance