Making A Gallery With 700 Sub Galleries Downloadable

I may have boxed my self into a corner.
I have 700 plus images of id cards for one of my schools in a gallery.
Each student is in their own subgallery since each image has to be password protected.
The school will give the student a password when they have paid their "student fees".
I cannot see a way to make all these sub galleries downloadable.
I simply cannot go and select each of them one at a time to make it work.
I do have several regular portrait galleries with download option but not with subgalleries
Is there another option??
If not I am really up the creek on this.
I have 1500 to 2000 more to do from various schools

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What exactly do you mean make them downloadable? Like free downloads on all of them? Or paid downloads?

If you have free or paid downloads in the price list then they would still be able to download even if they are in sub galleries.

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Thank you.
I went back for the millionth time and discovered my download price list was faulty.

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