I recently got hold of an old iPad (gen 3, iOS 9.3.6) which works fine. The problem is that it refuses to install a sizable portion of apps, because the newest versions require higher iOS version. That's fine.
Two specific questions:
How do I tell if the app store still has the old version? (people say it's up to the developer to remove the old versions from the app store)
How do I install them if I do not own any other iOS device (iPhone or whatever). So the "App store | Purchased | Not on this iPad" trick won't work?
Would jailbreaking help?
Example apps I'd love to install: Spotify, Google Keep.