This means that eventually the functionality of the subscription and the perpetual license version will drift apart, and it will be even harder to say what feature is in which version. Keep in mind that the feature set is basically frozen for the perpetual license version, and you will only get bug fixes (and things that Adobe deems important enough to add them even though they said "no new features). to test something on an old configuration). I have to do this every now and then for my customers (e.g. The biggest advantage of the perpetual license (I have one of these too) is that it will work in 10 years from now, if you can dig up an old computer that has the right version of the operating system. If you would be upgrading to every new version of Acrobat (as I've done since version 4), you are not spending more money, but you are getting all the new features automatically.