In this app, you can download the profile pictures of any user on Instagram, no sign-in required.

To do this, first you need to enter the username of the user you want to download. Then, you need to enter the user's ID.

After that, you need to open the URL of the user's Instagram profile. Then, you will see a "Zoom" button on the top right corner of the screen. You need to tap this button and enter the user's name. After that, you can tap the "Download" button.