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How to activate Katfile Premium Voucher:

1. You will receive a Katfile premium voucher like this: 7999xxdlnd5774la

2. You should be log in : https://katfile.com/login.html

( If you haven't account at Katfile, you just need to sign up: https://katfile.com/?op=registration )

3. Make sure you are logged in. Then access this link: https://katfile.com/?op=my_account

4. Put your voucher code in field "Apply Premium Key", and click on "Apply"