

Close the non-Vanilla launcher and also exit it from the system tray (if present).If the issue has started to occur of a glitch in a mod (after the mod was applied to a non-vanilla launcher), then opening Minecraft through the Vanilla Minecraft launcher may solve the problem. Then click on Force Update and once the Minecraft launcher is updated, check if the download file issue is resolved.Open the Minecraft Launcher and next to your username, click on Options.

The failed to download issue could be the result of an outdated Minecraft launcher here, updating Minecraft to the latest release may solve the problem.

Corrupt/ Incompatible Minecraft Mod: Mods are enhancements to the Minecraft game but if any of the installed Minecraft mods on your system are corrupt (or incompatible) with the OS/game, it may result in conflicts within the game itself.If your Minecraft installation is missing an essential update, it can halt the download process. Outdated Minecraft Game/ Launcher: The Minecraft launcher is updated regularly to fix bugs and keep up with other OS modules.
