PHP/Wordpress form debug

IN PROGRESS
Bids
20
Avg Bid (GBP)
£67
Project Budget (GBP)
£20 - £250

Project Description:
On my wordpress website I have a password-protected download form that works as following:

type in the correct password > download file

This works on Chrome, Firefox and Opera but doesn't on Internet Explorer, where you get redirected to the file address but get a 404 error. - I need someone to look at the code and fix this ASAP.

Thanks

Skills required:
Javascript, PHP, Wordpress
About the employer:
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