How to control downloads

I have a how-to question. How do I control downloads made from my server so that the same 1 visitor can download 1 file at a time. For eg. 1 visitor cannot download 10 large 5mb file at the same time (because of causing my cpu load). If possible to specify the directory as well?

My server load is still above average at times due to high httpd (apache). After checking, they are several .zip file download and I want to control the number of downloads. I know this can be done as I usually download video from another website which I can only download 1 file at a time before the next one.

I was told I need an apache module, any suggestion and "how-to" installation guide?

Thanks

 

 

 

 

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