Nik, are the parameters of a “Lifetime” purchase defined somewhere? Nitro is currently at 1.0 (or thereabouts). Presumably Nitro 1.1, 1.2, 1.3 etc are included in the Lifetime purchase but will Nitro 2.0 require purchasing a new licence? Apps are all over the map in this regard, Affinity Photo provided free updates for several years while others upgrade to a new version (eg. 2.0) every year. Where do you expect Nitro will fit into this cycle of upgrades and updates?