Content delivery network

A similar situation with software updates. For example, a new version of the program was released and everyone immediately started to download it. Even at small sizes, the channel will be quickly hammered, because some programs, for example Libreoffice offers as an option a download via torrent (the ideal solution for this kind of things).
You can use the services of CDN.

Perhaps you are faced with how long the update of the operating system on smartphones takes place. Let's say that the update is ready for your model and you will receive it in the order of the live order within 2 months. This is also an option, but not very pleasant.

By the way, the CDN service is not cheap. It costs 1Gb traffic from 3 rubles and above. The cheapest on decent services is 1 rub. For 1Gb. Because you can look for other options, if Torrent suits you, this may be the best solution.

When choosing, I recommend contacting the support team and asking specific questions. You should forecast your traffic. And ask a question about specific figures. Then we can make a real choice.