instagram download

Basically, I have a question about downloading instagram images. How do you guys do it if I want a very high quality image? Also say I want to re-upload it again on instagram, I read somewhere that I have to change something in the picture so instagram would think its original and not already...

I saved a bunch of pictures in different collections on my IG account, and I would like to download all pictures (from a specific collection only) at once (in original quality and uncropped). Is there a way to do that ? I've seen a few services allowing to download in bulk based on a...