This tutorial assumes you've already logged in to your WHMCS admin panel
Now let's learn how to manage downloads
1) Go to the Support menu

2) And click Downloads
 
3) Click Add Category
 
4) Type a Category Name and Description
 
5) Click Add Category
 
6) Now click the category we just added

7) Click Add Download
 
8) Choose the Type
 
9) Enter a Title and Description
 
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You can upload a file using an FTP manager then type the URL to the file, or upload directly from your computer
10) We'll choose Upload File
 
11) Click Browse
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12) Locate the file on your local machine and click Open
 
13) To allow only logged in clients to download the file, check this box

14) Click Add Download
 
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That's it! You now know how to manage downloads in WHMCS