How to create buttons in wordpress (Opening of popup in modal) and make sure the file is downloaded after the popup form is filled

I am new to wordpress and I need your help in placing the buttons for every post.(down under like Fee Enquiry
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Also I need your help(How to give prospectus to students after they click on download prospectus)

All you want to know about Chartered Accountant (CA) credential before getting started with the CA course