To download stuffs from Instagram just follow the steps:
Download InstaSave app on your Android device.
Now log into InstaSave with your Instagram credentials.
Here you can see all the photos or videos with a download icon.
Just tap on it and save.
You can also download Instagram moments on PC to keep your memories, to download just follow:
Go to Instaport
Login with Instagram credential.
Now you can choose to download entire photos or some of selected ones.