Minehut uses a service called file.io to download your worlds. File.io changed recently so that free users can only upload up to 100mb max. So if your world is over 100mb, the download wont work.
At the moment, if your world is over 100mb, there is no way Minehut provides to download your world. You can try using a world download mod if you really need to but I doubt you'd find many for 1.16.1 as it's a relatively new update.
Will they add something new so i can download my world?
Downloading world failed to upload file
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Will they add something new so i can download my world?