Before you try to fix it, you need to know what you are up against:
4K Stogram allows downloading without logging in (public data only), but logged-in sessions are more reliable and can access private accounts you follow. However, Instagram session cookies expire. If your token expires mid-download, the next API request will be rejected with an authentication error. 4k stogram api error
For heavy archival work (e.g., saving 100+ accounts): Before you try to fix it, you need
The developers at 4K Download are constantly playing whack-a-mole with Instagram’s changes. Before you try to fix it