I love the idea of a downloadable version because I suspect there are a lot of business cases of

* Need to make a relatively narrow change to a PDF (add a line, reorder pages, concatenate two files)

* Adobe is $$$ and pretty much a subscription-only fiasco. Even the most trivial tasks are paywalled.

* Even if you're paying for Adobe at a corporate level, getting the IT clearance to get it installed might be more time sink than the actual task,

We have a server that had pdftk installed to generate some pre-filled documents and I ended up using that to concatenate two PDF files instead of fighting to get Real Acrobat.