Most comments/answers already at earlier post: http://feedback.4kdownload.com/?ia=117838
It's not 4k Stogram's fault: Facebook, which owns Instagram, suddenly and without warning shut off a huge amount of data access via the Instagram API, effectively shutting down a huge number of 3rd party apps built on (and developers using) that platform.
See stories here:
4K released a fixed version, but Facebook/Instagram changed access again, and as of right now, the program is not functional. (Fingers crossed for resolution!)
Hello guys! Please contact support@4kdownload.com directly and they will help you asap!
The issue with new Instagram APIs was fixed in the newest 4K Stogram updates.