Ok, here what I did,
Seller admin > Edit Account Preferences
Common Thank-You Email Subject => I wrote only [%item_name%] Purchase into that field
Common Thank-You Email => I wrote the following text into text area
Dear [%first_name%],
You can download [%item_name%] at
[%download_link%]
Please keep this download link to have access to updated versions. The download link will expire after [%max_downloads%] attempts.
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The problem is the email that goes to client. It goes as below
Dear [%first_name%], You can download [%item_name%] at
No name written, no item name is written, no download link or max downloads number.
What am I doing wrong?